Stephen Price Posted March 9, 2010 Share Posted March 9, 2010 Hello, As both the 5D MKii and 7D are CMOS sensors, are they like most CMOS chips and prefer daylight balanced light? Is there a sensitivity difference between these two colour temperatures? And does using Tungsten light produce more noise in the blue channel like a RED? If you were to shoot table top subjects in a studio, and had a choice of either 3200k or 5600k, what would produce the cleanest image? Many thanks Steve Link to comment Share on other sites More sharing options...
James Brown Posted March 9, 2010 Share Posted March 9, 2010 If you were to shoot table top subjects in a studio, and had a choice of either 3200k or 5600k, what would produce the cleanest image? I personally found that it did not have the same sensor response as a red. From my experience shooting at roughly 100-400 ISO i couldn't tell the difference even projected on a large screen. Cheers, James. Link to comment Share on other sites More sharing options...
Noah Yuan-Vogel Posted April 8, 2010 Share Posted April 8, 2010 (edited) It definitely does make a difference. Here are some very basic tests I did regarding shadow noise levels for varying ISO/WB settings: http://www.dvinfo.net/forum/canon-eos-7d-h...oise-tests.html (the second image first column should be labeled WB not ISO) These of course dont tell you anything about any of the other characteristics of the image, but I think it gives you a narrow view that helps give a pretty good idea of what to do if you absolutely want the cleanest shadows. On the other hand, I always use HTP despite the negative impact on shadow noise since I always prefer more highlight detail. I only ever turn it off if working with a scene that is low enough contrast there is no chance of anything coming within a stop of blowing out, or if the scene has a lot of important detail in the highlights since things get a bit washed out in the highlights with HTP as highlight contrast is reduced. Clearly 5000k is the best WB to use, as expected for a silicon-based imaging sensor. I do agree that the difference is not as pronounced as in RED ONE, though. Edited April 8, 2010 by Noah Yuan-Vogel Link to comment Share on other sites More sharing options...
Premium Member Satsuki Murashige Posted April 8, 2010 Premium Member Share Posted April 8, 2010 Thanks for sharing those tests, Noah! I've downloaded them for reference, hope that's ok. :) Link to comment Share on other sites More sharing options...
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