tag:blogger.com,1999:blog-85685028759740018932024-03-19T05:16:19.581-07:00Foveon and moreStoneagehttp://www.blogger.com/profile/14245404611016164442noreply@blogger.comBlogger11125tag:blogger.com,1999:blog-8568502875974001893.post-19567917599176527632018-05-07T01:49:00.001-07:002018-05-07T01:52:16.959-07:00Sigma Photo Pro 6.6.0: Bug with GPU Acceleration Mode and dp Quattro<div class="separator" style="clear: both; text-align: center;">
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There seems to be a bug in the latest release of Sigma Photo Pro (6.6.0) at least with the<br />
following hardware:<br />
Mac Pro 2010 - 12-core - ATI Radeon HD 5770 - Sigma dp0 Quattro<br />
<br />
If the <b>GPU Acceleration Mode</b> is active, there can be color loss in certain areas of<br />
the image.<br />
This happens especially when some chroma noise reduction has been applied.<br />
<br />
If chroma noise reduction is set to the far left position, the problem is gone, but there is still a<br />
very slight reduction in color saturation apparent.<br />
<br />
<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjaaDtv9SlkujalaT_tQ8hkIJfVlPSH7qULTL8WwDIfnYN4KDdxjIs8o1P304o0vv_QZvEr4LPEC_L_do6hg4RIyRJ0y2GP8tHPceL1pKz92To7kl1IosyaaEVQ4lPDx4Rx6NkJ5bk_hTE/s1600/SPP_Grafikbug.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="552" data-original-width="704" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjaaDtv9SlkujalaT_tQ8hkIJfVlPSH7qULTL8WwDIfnYN4KDdxjIs8o1P304o0vv_QZvEr4LPEC_L_do6hg4RIyRJ0y2GP8tHPceL1pKz92To7kl1IosyaaEVQ4lPDx4Rx6NkJ5bk_hTE/s1600/SPP_Grafikbug.jpg" /></a></div>
<br />Stoneagehttp://www.blogger.com/profile/14245404611016164442noreply@blogger.com0tag:blogger.com,1999:blog-8568502875974001893.post-56692804009850427402017-12-26T10:54:00.003-08:002017-12-26T11:51:03.265-08:00Sigma "Merrill" micro-contrast<b>Micro-contrast exposed:</b><br />
<br />
There are still many discussions about the pronounced micro-contrast of the Sigma "Merrill"cameras.<br />
Some love it, others criticize it and prefer the softer look of the "Quattro" generation.<br />
There are claims that, because of the harsh look, the "Merrills" are not good for portraits but better for landscapes etc.<br />
<br />
The fact is: It's your decision if you want the image to be harsh or smooth. It's all "hidden"<br />
in Sigma Photo Pro.<br />
<br />
<b>There are three main settings that affect the micro-contrast of the image:</b><br />
<span style="color: #990000;"><br /></span>
<br />
<ul>
<li><span style="color: #990000;">SPP chroma noise reduction</span></li>
<li><span style="color: #990000;">SPP monochrom mode</span></li>
<li><span style="color: #990000;">exposure (before taking the image, not within SPP)</span></li>
</ul>
<span style="color: #990000;"><br /></span><ul>
</ul>
<b> 1. Chroma noise reduction:</b><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjmN_KOhlQoZF9PTb0XHB2itRL0YipXUddrefRVNz4rJwLLe1bRe_Czi4-XA14kPEvVlA61c4N6Xlge8SFbzrrv9ZNPnHvKiJJwqwTSuQUMmKljz8ywYZcf6lM6lEGZcsrJD66HKeccvbY/s1600/NR.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="37" data-original-width="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjmN_KOhlQoZF9PTb0XHB2itRL0YipXUddrefRVNz4rJwLLe1bRe_Czi4-XA14kPEvVlA61c4N6Xlge8SFbzrrv9ZNPnHvKiJJwqwTSuQUMmKljz8ywYZcf6lM6lEGZcsrJD66HKeccvbY/s1600/NR.jpg" /></a></div>
<br />
<br />
<br />
<br />
Less chroma noise reduction produces less micro-contrast<br />
More chroma noise reduction produces more micro-contrast<br />
<br />
<b>2. Monochrom mode:</b><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjeEa39F-CT3mw3TNKaRdMiHTXQXUvO-JHoeId7PNYjWq0qkZax7vc3n7SPHFJj0WpbdmKymRkf984OyZiRdjhgPQkRdnwG6M-vrRAU0ZpUfuapsAn7sWRuyNVHr0BoLjjE8Ex35pGQdzI/s1600/monochrom.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="29" data-original-width="249" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjeEa39F-CT3mw3TNKaRdMiHTXQXUvO-JHoeId7PNYjWq0qkZax7vc3n7SPHFJj0WpbdmKymRkf984OyZiRdjhgPQkRdnwG6M-vrRAU0ZpUfuapsAn7sWRuyNVHr0BoLjjE8Ex35pGQdzI/s1600/monochrom.jpg" /></a></div>
<br />
<br />
<br />
<br />
Using SPP monochrom mode produces less micro-contrast.<br />
Yes you lose the color, but the solution is simple:<br />
1. convert a color version of your image<br />
2. convert a monochrome version of your image<br />
3. Open both images in Photoshop as layers, put the monochrom image on top<br />
and set the blending mode to "luminance"<br />
Now you have the colors of the color image and the luminance information of the<br />
smoother monochrome image.<br />
<br />
<b>3. Exposure:</b><br />
More exposure while taking the shot results in less micro-contrast.<br />
More exposure/light "fills" each pixel with more data/color information, thus,<br />
Sigma Photo Pro doesn't need to apply its micro-contrast generating chroma noise reduction.<br />
<br />
<b>Lets have a look what this means in a real world sample:</b><br />
<br />
Here is an "underexposed" and an "overexposed" photograph of the same scene.<br />
(bracketing on a tripod)<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhRbzEQ-hXNxzoaRA_EGYwG2s__W4KbftJ-nOo9zE4MfCU1sRmhVrU5FTpPe2WQwMAcyiLBupzAbwyu4RWrvDzUHsGNBhtrad-d9-Gr-HYacAbXJXkvYXErPuDQZu6e9UK8LXp52ShF3GA/s1600/exposure.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="601" data-original-width="800" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhRbzEQ-hXNxzoaRA_EGYwG2s__W4KbftJ-nOo9zE4MfCU1sRmhVrU5FTpPe2WQwMAcyiLBupzAbwyu4RWrvDzUHsGNBhtrad-d9-Gr-HYacAbXJXkvYXErPuDQZu6e9UK8LXp52ShF3GA/s640/exposure.jpg" width="640" /></a></div>
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Lets bring them to the same brightness in Sigma Photo Pro:</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi2liuHiPafBKndMJiyfcxEdULBnGiqivJ7Kmo52b2KuOXtkYnJnhyphenhyphen5CDzPO2IcVQasnvF6dJrr0pqi0GWTCer2XSrl5rR-MKzMz9MedoHl6ienH2kBZzAZF18lj8x7o1vS4z7frLz4urM/s1600/equalized.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="601" data-original-width="800" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi2liuHiPafBKndMJiyfcxEdULBnGiqivJ7Kmo52b2KuOXtkYnJnhyphenhyphen5CDzPO2IcVQasnvF6dJrr0pqi0GWTCer2XSrl5rR-MKzMz9MedoHl6ienH2kBZzAZF18lj8x7o1vS4z7frLz4urM/s640/equalized.jpg" width="640" /></a></div>
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They look similar now. Now let's take a closer look at the ancient door:</div>
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Clearly visible that the lesser exposed image on the left has less color and stronger micro-contrast.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhX9xZ5g4BHgIx_G1TiHgTn8on1n1_kKSNX0XQoaiOGVCtZ_cZs9R0u0mhxDg3szvhLoMAsZzwoHJSluOP6xFIlDtpulD9LNLs_800WoFyG36WQSpgtdbCQeSJQonNGcuc5x_UZWROrNG0/s1600/comparison_exposure_crop.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="762" data-original-width="852" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhX9xZ5g4BHgIx_G1TiHgTn8on1n1_kKSNX0XQoaiOGVCtZ_cZs9R0u0mhxDg3szvhLoMAsZzwoHJSluOP6xFIlDtpulD9LNLs_800WoFyG36WQSpgtdbCQeSJQonNGcuc5x_UZWROrNG0/s1600/comparison_exposure_crop.jpg" /></a></div>
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<b>Chroma noise reduction</b></div>
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Let's apply more and less chroma noise reduction to the lesser exposed image.</div>
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Again quite clearly, more chroma noise reduction (+2) leads to more micro-contrast </div>
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<b><br /></b></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjSU6z21bKpSyaVnWCdSmGDwKucxbz-jfgMjx6BlqhuUkE4W1CRIBxXTpHneucLeJDMGcyUdGlhIrzVwJEE_koeFfHw3i7xL60m9C6RPAtvLM3hvk6e6WRN1bRr8BXavHc7lYYILxIYvx4/s1600/comparison_noise_reduction_crop.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="762" data-original-width="852" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjSU6z21bKpSyaVnWCdSmGDwKucxbz-jfgMjx6BlqhuUkE4W1CRIBxXTpHneucLeJDMGcyUdGlhIrzVwJEE_koeFfHw3i7xL60m9C6RPAtvLM3hvk6e6WRN1bRr8BXavHc7lYYILxIYvx4/s1600/comparison_noise_reduction_crop.jpg" /></a></div>
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<b><br /></b></div>
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<br /></div>
<b>SPP monochrom mode</b><br />
The same image (1/6s exposure) on the left with a SPP monochrom conversion as luminance layer.<br />
Result: less micro contrast<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjndRJMgRy91em8ANy3-ziCuiTXYVma_hKoZenNy8uRhF6qaW0o5dkVhcP37QEP1DVcsKpbVs3BvTfk3CkU0P61KRJqr4ZVlxayFZkz1aftoeG6J1s1GA1z6tIEh73YHZo4Pt45YgTazt4/s1600/monochrom_vs_color.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="762" data-original-width="852" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjndRJMgRy91em8ANy3-ziCuiTXYVma_hKoZenNy8uRhF6qaW0o5dkVhcP37QEP1DVcsKpbVs3BvTfk3CkU0P61KRJqr4ZVlxayFZkz1aftoeG6J1s1GA1z6tIEh73YHZo4Pt45YgTazt4/s1600/monochrom_vs_color.jpg" /></a></div>
<br />
<b>And finally the two extreme samples side by side</b><br />
Left: more exposure and monochrome<br />
Right: less exposure plus maximum chroma noise reduction<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgmIBXbJA2XmthXhGBluDu6yqyZps7Od_-BjzDvP7hiTOs8c7UqtEy7rByMOg0Q-hB8Y9ZJBPr16YRWUzyHjVSJC36KNvi3Tcx4C2UCkGG16PGjdFR5l9vK3vVSH9bs1CBaRaUqL8flnyE/s1600/extreme.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="762" data-original-width="852" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgmIBXbJA2XmthXhGBluDu6yqyZps7Od_-BjzDvP7hiTOs8c7UqtEy7rByMOg0Q-hB8Y9ZJBPr16YRWUzyHjVSJC36KNvi3Tcx4C2UCkGG16PGjdFR5l9vK3vVSH9bs1CBaRaUqL8flnyE/s1600/extreme.jpg" /></a></div>
<b><br /></b>
<b>Conclusion:</b><br />
These different methods can be used, tweaked and combined to get exactly the look you want.<br />
Sigma gave us, presumably unintentional, a very powerful tool with the Merrills and Sigma Photo Pro. It's almost as if you have different cameras in one device.<br />
Unfortunately, all the described options are gone with the Quattro generation.<br />
<br />
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<b><br /></b>
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<b><br /></b>Stoneagehttp://www.blogger.com/profile/14245404611016164442noreply@blogger.com0tag:blogger.com,1999:blog-8568502875974001893.post-3653493950021261882017-10-14T03:22:00.000-07:002017-10-14T03:22:37.313-07:00Sigma Quattro’s 2-pixel noise artifact finally gets some attention at dpreview.<div style="font-family: Helvetica; font-stretch: normal; line-height: normal;">
Quattro’s 2-pixel noise artifact finally gets some attention at dpreview.</div>
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<br /></div>
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Thread: <a href="https://www.dpreview.com/forums/post/60234129">https://www.dpreview.com/forums/post/60234129</a></div>
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Samples from the OP: <a href="https://www.dpreview.com/forums/post/60240987">https://www.dpreview.com/forums/post/60240987</a></div>
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I addressed this issue more than 3 years ago already in that forum.</div>
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I called it „ants“, „flecks“, „spots“ or „2-pixel noise“</div>
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<br /></div>
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Here from 2014:</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjuc7FdCjs8gcUv7BUf6I6IJowsnJZoNNYqmxgcw0r03YGBGApQcsbWKjTJ3piGxCQsZmjW-u3BnMpPaYQMpHZp_W-0dDyXBugxpmAf8GdWTzZiKzyP0QpMlQdUDESN0cC-WzcaARFdvWY/s1600/black_spots.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="713" data-original-width="712" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjuc7FdCjs8gcUv7BUf6I6IJowsnJZoNNYqmxgcw0r03YGBGApQcsbWKjTJ3piGxCQsZmjW-u3BnMpPaYQMpHZp_W-0dDyXBugxpmAf8GdWTzZiKzyP0QpMlQdUDESN0cC-WzcaARFdvWY/s640/black_spots.jpg" width="639" /></a></div>
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<span style="font-family: Helvetica; text-align: center;">In march 2016 the problem was not solved:</span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiD9_DZokzylLNrM0MgYP26zKpymuZ43LYL7at9qHtc34z68K43Hesnj54gnpn79aPL3lsCV6w_Y_Cnw9lxbojfDjSATDFVAqvmkMdvIrgBrht2sW-fsyYFz6CoSkR6H-F5xdUmeZPyOFo/s1600/artifacts_ants.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="421" data-original-width="1092" height="246" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiD9_DZokzylLNrM0MgYP26zKpymuZ43LYL7at9qHtc34z68K43Hesnj54gnpn79aPL3lsCV6w_Y_Cnw9lxbojfDjSATDFVAqvmkMdvIrgBrht2sW-fsyYFz6CoSkR6H-F5xdUmeZPyOFo/s640/artifacts_ants.jpg" width="640" /></a></div>
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August 2016 (noise reduction can't remove it)</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgUEbVYFFuQS3RMu7_3tnsH3_PUqkZFMgZrinGGnFo3r0xpBiSBX47HhdCOIXr8WjTRSwnt6w1hlmLHLxcqgNuRrEkfyR6EiwrpGYxMwsc3YWSnPoqOaoNiZrsNrBkAD7wb7ekEXevObEo/s1600/flecks.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="895" data-original-width="1276" height="448" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgUEbVYFFuQS3RMu7_3tnsH3_PUqkZFMgZrinGGnFo3r0xpBiSBX47HhdCOIXr8WjTRSwnt6w1hlmLHLxcqgNuRrEkfyR6EiwrpGYxMwsc3YWSnPoqOaoNiZrsNrBkAD7wb7ekEXevObEo/s640/flecks.jpg" width="640" /></a></div>
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It seems that only forum member <b>tagscuderia</b> recognized this error also and mentioned it repeatedly.</div>
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Just like now again:</div>
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<a href="https://www.dpreview.com/forums/post/60237918">https://www.dpreview.com/forums/post/60237918</a></div>
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<i><b>„As a dp0 owner let me say that the 2-pixel crawl artefact was evident from day one and has been touched upon on here... but seemingly only Maceo and myself could see it?! We did however both independently report it to SIGMA with examples“</b></i></div>
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Probably he won't be heard again.</div>
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Stoneagehttp://www.blogger.com/profile/14245404611016164442noreply@blogger.com1tag:blogger.com,1999:blog-8568502875974001893.post-87849047119544780782017-09-11T10:55:00.001-07:002017-09-18T06:22:47.701-07:00How to avoid/minimize color casts using vintage lenses on the SD1 Merrill<div style="font-family: helvetica; line-height: normal;">
<b>How to avoid/minimize color casts using vintage lenses on the SD1 (Merrill)</b></div>
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<span style="font-family: "helvetica"; font-size: 12px;">(</span><span style="font-family: "helvetica";"><span style="font-size: 12px;">thanks to user 'motionride' from <a href="http://bilderforum.de/">bilderforum.de</a>)</span></span></div>
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The Sigma SD1 is known to have problems with vintage lenses. Depending on the lens and aperture setting, you get strong color shifts/vignetting.</div>
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Previous generations SD9/SD10/SD14/SD15 do not show this behaviour, or only very little.</div>
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Until now, the procedure has been as follows:</div>
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Set your camera to A (Aperture Priority) and choose the "Reference Aperture":</div>
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F5,6 for the SD9</div>
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F2.8 for the SD10</div>
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F1.0 for the SD14, SD15 and SD1*</div>
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And now you’re good to go..... *but not with the SD1</div>
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With the SD1 it has been found that color shifts can be minimized by setting the camera aperture to the same aperture as the lens. </div>
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How does it work?</div>
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<b>1. Use the standard method: </b></div>
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<b>-Set your SD1 camera to A mode and set it to F1.0</b></div>
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<b>-Set your preferred aperture on the lens (for example F5.6)</b> and the camera will display the correct exposure. (for example 1/250)</div>
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The exposure will be correct now but unfortunately this causes color shifts.</div>
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<b>2. Remember the suggested exposure time (1/250) and switch your camera to M (Manual Mode) </b></div>
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<b>Now set the time to 1/250 and set the aperture to the same aperture as on the lens (F5.6 in this case)</b></div>
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3. Shoot and be amazed how the color shift has gone.</div>
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The following screenshots from SPP show the difference between the two methods.</div>
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Even though the same exposure time and aperture was used for the images, the color shift is virtually eliminated:</div>
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<b>SD1 with Cosinon 55mm F1.4 (M42-mount)</b></div>
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhbL8h6G8C8leKUnAXOusj8SGcgxH4nlmWBblR_dVClh-0x2MZ04Ydt8LInEHsAicX3mRc9hvntjoCFDnicxGpOComhaJz12Mz4iJa42ZvL8vRuEkyrpMvqJQKbLxmSqOYVlxSGogSxx5o/s1600/overview_cosinon.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="271" data-original-width="1518" height="113" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhbL8h6G8C8leKUnAXOusj8SGcgxH4nlmWBblR_dVClh-0x2MZ04Ydt8LInEHsAicX3mRc9hvntjoCFDnicxGpOComhaJz12Mz4iJa42ZvL8vRuEkyrpMvqJQKbLxmSqOYVlxSGogSxx5o/s640/overview_cosinon.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-size: small;">click for full res</span></td></tr>
</tbody></table>
<div style="font-family: helvetica; line-height: normal;">
<b>SD1 with Carl Zeiss 135mm F3.5 (M42-mount)</b></div>
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhQoV_Br26ZYh6ocZPHRSLNJ3_JDGDYCjYID4SnLtxmsmao-liTuDzj0FYuXxBXGHiZ9jr9L8gyppMVQqQhYcuHkRdJ8Ogv-3x6NicVrHkI2crFz-4d_move0eVtwdrkim377V3U_C9Lgw/s1600/overview_zeiss.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="267" data-original-width="1517" height="112" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhQoV_Br26ZYh6ocZPHRSLNJ3_JDGDYCjYID4SnLtxmsmao-liTuDzj0FYuXxBXGHiZ9jr9L8gyppMVQqQhYcuHkRdJ8Ogv-3x6NicVrHkI2crFz-4d_move0eVtwdrkim377V3U_C9Lgw/s640/overview_zeiss.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"><span style="font-size: small;">click for full res</span></td></tr>
</tbody></table>
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Stoneagehttp://www.blogger.com/profile/14245404611016164442noreply@blogger.com4tag:blogger.com,1999:blog-8568502875974001893.post-51944220387944573152017-06-01T05:06:00.001-07:002017-06-01T05:08:14.751-07:00High ISO comparison: Sigma sdQH (DNG) vs. dp1m @ ISO1600Sigma sd Quattro H review (dpreview)<br />
<a href="https://www.dpreview.com/reviews/sigma-sd-quattro-h" target="_blank">https://www.dpreview.com/reviews/sigma-sd-quattro-h</a><br />
<br />
The DNG implementation seems to be poor and only usable at very low ISO:<br />
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Look at the difference between the sd Quattro H and the good old dp1 Merrill at ISO 1600:<br />
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEivK4_DoNYDnVEVLGR5JshgrQM0qZXF0OeqwEorbPRxUePgnZ1iy02TmGxMm09iDuRUSDj18RFODaYj_Oxoonz2aUTuUMyQD4I1XgenH54jJCQ_xzQjQeo-BnwhzH4XHnX3cHtYL9_Z8w0/s1600/sdQH_DP1m_ISO1600.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="1000" data-original-width="1000" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEivK4_DoNYDnVEVLGR5JshgrQM0qZXF0OeqwEorbPRxUePgnZ1iy02TmGxMm09iDuRUSDj18RFODaYj_Oxoonz2aUTuUMyQD4I1XgenH54jJCQ_xzQjQeo-BnwhzH4XHnX3cHtYL9_Z8w0/s400/sdQH_DP1m_ISO1600.jpg" width="400" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Click for 100% </td></tr>
</tbody></table>
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Stoneagehttp://www.blogger.com/profile/14245404611016164442noreply@blogger.com0tag:blogger.com,1999:blog-8568502875974001893.post-18385092252057701002017-05-24T06:18:00.000-07:002017-05-24T06:18:02.900-07:00Quattro SFD mode still "Beta"Quattros SFD mode still shows weird artifacts, even on static subjects.<br />
<a href="https://www.dpreview.com/forums/post/59603119" target="_blank">https://www.dpreview.com/forums/post/59603119</a><br />
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjSSOwWT9u63Apkulxv_Y6FlqAbyUWKG1vj_dYjspfffPm-T6qQZwxb6v40R-XPyVHZoE5IIA7lza6N83E0Pk7kPQoZ6FxnkacoOXX0QHIbwpzUf5Nzm-kIsPzvtjb20YR2EMpO01GEk3Y/s1600/sfd_artifacts.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="500" data-original-width="1500" height="211" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjSSOwWT9u63Apkulxv_Y6FlqAbyUWKG1vj_dYjspfffPm-T6qQZwxb6v40R-XPyVHZoE5IIA7lza6N83E0Pk7kPQoZ6FxnkacoOXX0QHIbwpzUf5Nzm-kIsPzvtjb20YR2EMpO01GEk3Y/s640/sfd_artifacts.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Click for 100%</td></tr>
</tbody></table>
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Forum comments are uncritically, as usual.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgCDYWt3QHGG7XQM9rid12iTGOSxEfQov8gzNfirPuFyb6JaevZroS826fbNrPeFdtIoaE_qnFTK_w5U_5mcNiu97aUkTaxsT74e-uTIj6HRSkDvaLPQfuqU25kG81PpVxOl18Anc1EimU/s1600/SFD_artifacts_comments.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="300" data-original-width="502" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgCDYWt3QHGG7XQM9rid12iTGOSxEfQov8gzNfirPuFyb6JaevZroS826fbNrPeFdtIoaE_qnFTK_w5U_5mcNiu97aUkTaxsT74e-uTIj6HRSkDvaLPQfuqU25kG81PpVxOl18Anc1EimU/s1600/SFD_artifacts_comments.jpg" /></a></div>
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<br />Stoneagehttp://www.blogger.com/profile/14245404611016164442noreply@blogger.com0tag:blogger.com,1999:blog-8568502875974001893.post-56101152813879073992017-03-21T06:42:00.001-07:002017-03-21T06:44:00.714-07:00Ongoing debate on DPREVIEW after a "Photo comparison between DP2M and new SDQ H with 35mm Art"Big discussion on dpreview...<br />
<a href="https://www.dpreview.com/forums/post/59286776" target="_blank">https://www.dpreview.com/forums/post/59286776</a><br />
...about the "shadow quality" and colors based on a DP2m photo that is <b>underexposed by 2 stops.</b><br />
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Exposure: Manual - 1/1000 - F6.3 - ISO: 200<br />
...doesn't make any sense.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiyHF29i4kYsJbRAtIfHFtaLkHnIfnOGsxziGTkd-0Qn39588RyNaGzM2cFkxreKNle0mRQez2fgGPwgoACqII6ENljrzOyo-_gzA5e_Xe3w3peLzd-K-K_60P-ApRY9c86j2w2B15q4bg/s1600/SDIM0627.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiyHF29i4kYsJbRAtIfHFtaLkHnIfnOGsxziGTkd-0Qn39588RyNaGzM2cFkxreKNle0mRQez2fgGPwgoACqII6ENljrzOyo-_gzA5e_Xe3w3peLzd-K-K_60P-ApRY9c86j2w2B15q4bg/s1600/SDIM0627.jpg" /></a></div>
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<br />Stoneagehttp://www.blogger.com/profile/14245404611016164442noreply@blogger.com0tag:blogger.com,1999:blog-8568502875974001893.post-42771308073279821532017-01-28T04:57:00.001-08:002017-01-28T04:59:14.876-08:00Sigma sd Quattro H vs. Sigma sd1 Merrill image comparisonMaro provided an image comparison between the sdQH and the SD1 with the 85mm 1.4 Art lens:<br />
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<a href="http://maros-notebook.txt-nifty.com/notebook/2017/01/sd1-vs-sd-qua-2.html" target="_blank">http://maros-notebook.txt-nifty.com/notebook/2017/01/sd1-vs-sd-qua-2.html</a><br />
<br />
At first, the images look quiet similar. But the statements in the dpreview forum are pretty harsh:<br />
<ul>
<li><i>"SD1 looks sharper!"</i></li>
<li><i>"Not only sharper. In Quatro I see a lot of color artefacts."</i></li>
<li><i>"If the SD1 had live view and an EVF, it would be the better camera. Certainly it produces a better image."</i></li>
<li><i>"Merrill was/is clearly outstanding!"</i></li>
<li><i>"This just makes me think what sort of fabulous camera a mirrorless SD Merrill H would have been."</i></li>
<li><i>"Once again the comparison show that 1:1:1 layers structure of the Foveon Merrill of the SD1 wins over the poor and rubbish 1:0.25:0.25 structure of the Quattro"</i></li>
<li><i>"The SD1M will be my last Foveon camera unless Sigma resurrects the Merrill chip in an improved body."</i></li>
</ul>
<div>
While the Quattro in general seems to have an edge regarding luminance resolution, many people</div>
<div>
seem to prefer the look of the Merrill generation.</div>
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So what is it?</div>
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Maybe these 200% crops help to understand:</div>
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(click images for full resolution)</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh1imzQuCz6nUwUBY0mJPsZB4XN_4gIsCbB9CISjp7cs9MzUfrfUR7vFeDZ5RLCed0PDENhxC5RWOBoQjc5jR1Za6BHFXBbHQf0fTyuO5QM4JHVVIDNdi-8rrBsVOlxCGQ0GbvcDWyxu_8/s1600/sample1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh1imzQuCz6nUwUBY0mJPsZB4XN_4gIsCbB9CISjp7cs9MzUfrfUR7vFeDZ5RLCed0PDENhxC5RWOBoQjc5jR1Za6BHFXBbHQf0fTyuO5QM4JHVVIDNdi-8rrBsVOlxCGQ0GbvcDWyxu_8/s400/sample1.jpg" width="400" /></a></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgbmZJwvKN5-p2jpMrUs6gMdC8WwdyEbvvE9FS6XCo2b0J4QuotJiy6UDNDVOm6cPusB4VBqwypc7CPwCm9QGdYAVefJJewugzYGHIitxc9zHUM0AcskMfZ9typNp00E1UWUFzS_HXD6gI/s1600/sample2.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgbmZJwvKN5-p2jpMrUs6gMdC8WwdyEbvvE9FS6XCo2b0J4QuotJiy6UDNDVOm6cPusB4VBqwypc7CPwCm9QGdYAVefJJewugzYGHIitxc9zHUM0AcskMfZ9typNp00E1UWUFzS_HXD6gI/s400/sample2.jpg" width="400" /></a></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiYHockxovBEyqU6bXyXEgLA1WaoFB4oW3S3-KX6iLw0-OgDbjrn-Jmto4uFNpkfUXHFliJMFPHHX2lhKPHDZjIadpV6opCzvjlIrfn7NqKrINDrFbc1OlIgtdwxh8jM0ZpCtTUUwMbtIs/s1600/sample3.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiYHockxovBEyqU6bXyXEgLA1WaoFB4oW3S3-KX6iLw0-OgDbjrn-Jmto4uFNpkfUXHFliJMFPHHX2lhKPHDZjIadpV6opCzvjlIrfn7NqKrINDrFbc1OlIgtdwxh8jM0ZpCtTUUwMbtIs/s400/sample3.jpg" width="400" /></a></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgFnBoxE_iRkr9vnu68Exp-CpN4gUAHgnvl-zbQCuMyAIHeSJFGtC6h5HYD5widkf2YDOTHJq14bkRV8bLXYXMddFBUVvSzy9oaPBvd5UsoUpj-xVMcj6_0PiaCnLcfV72cs_L-iEVs5zw/s1600/sample4.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgFnBoxE_iRkr9vnu68Exp-CpN4gUAHgnvl-zbQCuMyAIHeSJFGtC6h5HYD5widkf2YDOTHJq14bkRV8bLXYXMddFBUVvSzy9oaPBvd5UsoUpj-xVMcj6_0PiaCnLcfV72cs_L-iEVs5zw/s400/sample4.jpg" width="400" /></a></div>
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<div>
Clearly visible how destructive the default luma-noise reduction setting works with Quattro files,</div>
<div>
but then luma-NR off shows how noisy the Quattro is on pixel level. </div>
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So, finding the balance between noise reduction and adding/lowering sharpness is the tricky part with Quattro, while the Merrill sensor seems to be more forgiving and stable. </div>
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Stoneagehttp://www.blogger.com/profile/14245404611016164442noreply@blogger.com3tag:blogger.com,1999:blog-8568502875974001893.post-17734364186493003902017-01-01T15:14:00.002-08:002017-06-03T09:44:25.756-07:00Image quality: SD Quattro low-res vs. DP2 vs. Fuji X-E1 (downsampled)<span style="font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;">Tom Schum from the dpreview forum made a comparison between these cameras:</span><br />
<span style="font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;">SD Quattro (low resolution 1:1:1 Foveon structure) vs. the original DP2 and the Fuji X-E1 (downsampled)</span><br />
<span style="font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;"><br /></span>
<span style="font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;"><a href="https://www.dpreview.com/forums/post/58888373" target="_blank">https://www.dpreview.com/forums/post/58888373</a></span><br />
<span style="font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;"><br /></span>
<span style="font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;">Some people claim, if you want true 1:1:1 Foveon quality with the sd/dp Quattros, you should use the </span><span style="font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;">low resolution mode. </span><br />
<span style="font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;"><br /></span>
<span style="font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;">Lets have a closer look at 200%: (ignoring the Fuji)</span><br />
<span style="font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;"><br /></span>
<span style="font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;"> <span style="font-size: x-small;">click image for full resolution:</span></span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjLbsFr1ivVjDxUlWOU74XK-SgQgCSUzc6w9iXWJyO7AUvyBgfyUe6xaVfdFLJrp8gITJUzLYtFEfJIdyMelAjqxi5RubqTYvLwyoO7tmbL0eQ2gGPxhUh7CG89xfFhGOiSk-5cR73GgzI/s1600/sdQuattro_low_res_vs_DP2.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1100" data-original-width="1201" height="586" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjLbsFr1ivVjDxUlWOU74XK-SgQgCSUzc6w9iXWJyO7AUvyBgfyUe6xaVfdFLJrp8gITJUzLYtFEfJIdyMelAjqxi5RubqTYvLwyoO7tmbL0eQ2gGPxhUh7CG89xfFhGOiSk-5cR73GgzI/s640/sdQuattro_low_res_vs_DP2.jpg" width="640" /></a></div>
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<span style="font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;">The sd Quattro sample looks sharper. (probably different sharpening amount) </span><br />
<span style="font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;">But have a look at the red and yellow surfaces of the boats.</span><br />
<span style="font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;">The dp2 looks natural, smooth and realistic </span><span style="font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;">while the sdQ is noisy and shows posterization.</span><br />
<span style="font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;"><br /></span>
<span style="font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;">Quattros shortcomings are evident even in low res (aka true 1:1:1 Foveon structure) which leads to the conclusion that the sensor itself is flawed. </span><br />
<span style="font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;"><br /></span><span style="color: #990000; font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;">Additional information:</span><br />
<span style="font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;"><br /></span>
<span style="font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;">A new conversion from the sd Quattro image with luminance noise reduction set to minimum:</span><br />
<span style="font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;"><br /></span>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEixPdXmjJLFmKHhsUR-ixlmVp2TqYBwohjKJd0gHjUcO3ac8y3QsQcrsY8Moj4h4qTxy-l6d51v_Paue-8ptKECvDDci7pasrqE0yEa1RGbukSxAzkFi_tqLYo4l6PchAQS8_8sMnOKM5M/s1600/sdQuattro_low_res_vs_DP2_part2.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEixPdXmjJLFmKHhsUR-ixlmVp2TqYBwohjKJd0gHjUcO3ac8y3QsQcrsY8Moj4h4qTxy-l6d51v_Paue-8ptKECvDDci7pasrqE0yEa1RGbukSxAzkFi_tqLYo4l6PchAQS8_8sMnOKM5M/s1600/sdQuattro_low_res_vs_DP2_part2.jpg" /></a></div>
<span style="font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;"><br /></span><span style="font-family: "helvetica neue" , "arial" , "helvetica" , sans-serif;">Posterization effect is reduced, noise/grid becomes more visible.</span><br />
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Stoneagehttp://www.blogger.com/profile/14245404611016164442noreply@blogger.com0tag:blogger.com,1999:blog-8568502875974001893.post-4608313142774300022016-12-20T02:35:00.004-08:002016-12-20T03:04:10.565-08:00SPP 6.5.0 vs. SPP 6.4.1, noise reduction comparison<span style="font-family: "verdana" , sans-serif; font-size: x-small;">(....and why the sd1 Merrill is the better performer)</span><br />
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<span style="font-family: "verdana" , sans-serif;">With the release of the new <a href="http://www.sigma-global.com/en/download/cameras/sigma-photo-pro/" target="_blank">Sigma Photo Pro 6.5.0</a> Sigma made some changes in the noise reduction processing for Quattro cameras.</span><br />
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<span style="font-family: "verdana" , sans-serif;">Sigma:</span><br />
<span style="color: #990000; font-family: "verdana" , sans-serif;"><i>"It has an improved algorithm in noise reduction when developing RAW data for the sd Quattro series and dp Quattro series."</i></span><br />
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<span style="font-family: "verdana" , sans-serif;">Let's see what has been changed:</span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhdZy7kUn_xVlbzEQB4iOATuTntBMaOAgeTjWUhf9dpX-3OdiCcTNe47FXwYnewfQsSySNoxhWvVKXfCWOWqWKRD_avBzrG9MJPfYXTlRq_EkfkZVZjslU1q6bJ9EA5ybucdM3uAhKLwUE/s1600/dp0Q_SPP641_vs_650.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="272" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhdZy7kUn_xVlbzEQB4iOATuTntBMaOAgeTjWUhf9dpX-3OdiCcTNe47FXwYnewfQsSySNoxhWvVKXfCWOWqWKRD_avBzrG9MJPfYXTlRq_EkfkZVZjslU1q6bJ9EA5ybucdM3uAhKLwUE/s640/dp0Q_SPP641_vs_650.jpg" width="640" /></a></div>
<span style="font-family: "\22 verdana\22 " , sans-serif;"><span style="font-size: x-small;">click the image for full resolution</span></span><br />
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<span style="font-family: "verdana" , sans-serif;">Conclusion:</span><br />
<span style="font-family: "verdana" , sans-serif;">-No changes when NR is turned off. (first row)</span><br />
<span style="font-family: "verdana" , sans-serif;">-</span><span style="font-family: "verdana" , sans-serif;">Middle position: </span><span style="font-family: "verdana" , sans-serif;">SPP 6.5.0 adds a slightly higher amount of NR. (but no improvement in the NR quality)</span><br />
<span style="font-family: "verdana" , sans-serif;">-Bottom: Again very slightly more NR applied.</span><br />
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<span style="font-family: "verdana" , sans-serif;">And now the SD1:</span><br />
<span style="font-family: "verdana" , sans-serif;">To keep it simple, i only show the best two versions.</span><br />
<span style="font-family: "verdana" , sans-serif;">Top: best default setting for this image</span><br />
<span style="font-family: "verdana" , sans-serif;">Bottom: overlay of a monochrome (blue channel) image over the color image.</span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhG6LoAPVwBZQIC9mKutbBu2cjAG9fv0WDmfcsodQTprD0k04q4mCpvWISBr9s5t5xjNjt7vQOZbDPlcVgZq36yshzn7z8GD_Upp1wYzU9lUMFg2O9cx2Lt-W51cOX9MWSZBFzHWsQoPJk/s1600/SD1_ISO1600.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="351" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhG6LoAPVwBZQIC9mKutbBu2cjAG9fv0WDmfcsodQTprD0k04q4mCpvWISBr9s5t5xjNjt7vQOZbDPlcVgZq36yshzn7z8GD_Upp1wYzU9lUMFg2O9cx2Lt-W51cOX9MWSZBFzHWsQoPJk/s640/SD1_ISO1600.jpg" width="640" /></a></div>
<span style="font-family: "verdana" , sans-serif;"><span style="font-size: x-small;">click the image for full resolution</span></span>
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<span style="font-family: "verdana" , sans-serif;">Conclusion: </span><br />
<span style="font-family: "verdana" , sans-serif;">-clearly better and cleaner rendering with less luminance noise on both SD1 samples.</span><br />
<span style="font-family: "verdana" , sans-serif;">(sharpness suffering a bit because of the mediocre edge performance of the 8-16mm lens)</span><br />
<span style="font-family: "verdana" , sans-serif;"><br /></span><span style="font-family: "verdana" , sans-serif;"><b>Better ISO performance of the Quattro? Still a myth..</b></span><br />
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<span style="font-family: "verdana" , sans-serif;"><br /></span>Stoneagehttp://www.blogger.com/profile/14245404611016164442noreply@blogger.com0tag:blogger.com,1999:blog-8568502875974001893.post-54055791880494786582016-12-08T05:48:00.002-08:002016-12-08T05:55:31.788-08:00DNG Unterstützung für die Sigma sd Quattro<span style="font-family: verdana, sans-serif;">Nun ist es endlich soweit und Sigma öffnet sich (wieder) für Dritthersteller wenn es um das Bearbeiten/Entwickeln Ihrer RAW Daten geht:</span><br />
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<a href="https://www.sigma-photo.co.jp/english/new/new_topic.php?id=624"><span style="font-family: "verdana" , sans-serif;">https://www.sigma-photo.co.jp/english/new/new_topic.php?id=624</span></a></span><br />
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<span style="font-family: "verdana" , sans-serif;">Als witzige Anekdote hier noch die Antworten einiger alter dpreview-Hasen, welche sich so gerne mit ihren persönlichen Kontakten zu Foveon/Sigma brüsten und gerne mal mit ihrem Hintergrundwissen prahlen, auf eben jene Frage nach einer möglichen DNG Untersützung:</span></span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjN2yp2-P-2_rfgNCCRV6SBqkgWXXfpnYnhbOrNCBh3jRODpASn7zYDAK6n7tBHuei4XWxSSFWy2MeD-jdwN_xbqu9FuR_fCm0G85c4Z1CE5zwe8Cj2O0kuT-CCgRKoGAeLmoiG39Dz1RU/s1600/Sigma_dng.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjN2yp2-P-2_rfgNCCRV6SBqkgWXXfpnYnhbOrNCBh3jRODpASn7zYDAK6n7tBHuei4XWxSSFWy2MeD-jdwN_xbqu9FuR_fCm0G85c4Z1CE5zwe8Cj2O0kuT-CCgRKoGAeLmoiG39Dz1RU/s1600/Sigma_dng.jpg" /></a></div>
<br />Stoneagehttp://www.blogger.com/profile/14245404611016164442noreply@blogger.com0