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Jonathan (11.05.16, 5:23 AM): Hey Michael, I use Capture One for editing and tried to reproduce this within that program and could not. Have you tried reproducing the problem in Canon's own DPP? Capture One? Another editing suite? The problem MIGHT lie with Adobe, and not with Canon (potentially).
Mark (11.04.16, 2:40 PM): Haven't had a chance to test yet. A theory though: the image is captured upside down and flipped left - right so this is actually the right hand side of the sensor. My 5d iv gets quite warm right around where the new control was added above the scroll wheel. I wonder if this heat is affecting the sensor?
Redcrown (11.04.16, 11:30 AM): Michael, Haven't taken the time to do controled test shots of a gradient step-wedge yet, but I tested on some -4 stop underexposed frames from bracketed HDR sets and I did not see the problem. I suspect the "defect" you show may be more related to the shadow recovery function in Adobe Camera Raw than the 5D4 sensor. However, it may be more pronounced on the 5D4's 30 mp sensor than a 15 to 20 mp sensor. ACR's shadow recovery is a very unique and strange beast. It uses a function called "Laplacian Filters" to analyze the image, which means the effect it applies depends on image content. The effect will vary based on the overall balance of shadows vs. midtones vs. highlights in the image. The effect will also vary depending on the size of a shadow area and it's relation (proximity) to higher tones. The more shadows there are in an image, the stronger the effect. Your test shots have very little highlights and a lot of shadow, so the effect would be very strong. And your left-side vs. right-side shots have a significant difference in the shadow/highlight ratio. That may account for the difference you see between left vs. right. I'll try to find time to do a controlled test later, but in the meantime I'd encourage you to do some additional testing. Shoot your step-wedge against a white background, making the frame mostly highlight with very little shadow. Shoot at different zoom levels to change the size and ratio of the shadow area. Also, consider testing with the "Fill Light" slider under the "2010" process of ACR. The older 2010 process does not use the Laplacian logic.