Well Michael the Maven made a post (http://www.canonrumors.com/forum/index.php?topic=30990.0) that got me to do my own testing so see if it was an isolated occurrence, or something that impacted my 5D4 as well. Turns out, YES...my 5D4 sensors experiences the same phenomena that could actually impact real-world results. Also worth noting is just how poorly my camera recovers shadows at ISO 100 versus ISO 50.
The details on what generated this phenomena: I underexposed by 5 stops and then recovered the RAW file 5 stops and pushed the shadows 100% to intensify the ability to see the problem. I then repeated 4 stops under and pushed them the same 5 stops and 100% shadows. The pattern appears to streak across the frame as if the results of the reading on the left side of the image impact the remaining photo-sites horizontally from it.
Obviously I never underexpose an image my as much as 5 stops, and the problem doesn't seem to appear when you're 3-stops under...but let's be real! This shouldn't happen at all PERIOD. I think I may be exchanging my 5D4 after I call Canon next week and see what they have to say about it. This could very well be a defect.
Image 1: 5D3 on the left and 5D4 on the right: ISO 50, 5-stops under, pushed 5-stops and 100% shadows
Image 2: 5D3 on the left and 5D4 on the right: ISO 100, 5-stops under, pushed 5-stops and 100% shadows
Image 3: 5D4 ISO 50 on the left and ISO 100 on the right: 5-stops under, pushed 5-stops and 100% shadows
Image 4: 5D4 ISO 50 on the left and ISO 100 on the right: 4-stops under, pushed 5-stops and 100% shadows
Image 5: Zoomed in to show detail on Image 3.
Image 6: Zoomed in to show detail on Image 4.
Just wanted to share my results here and I'll add more information after I speak to Canon.
The details on what generated this phenomena: I underexposed by 5 stops and then recovered the RAW file 5 stops and pushed the shadows 100% to intensify the ability to see the problem. I then repeated 4 stops under and pushed them the same 5 stops and 100% shadows. The pattern appears to streak across the frame as if the results of the reading on the left side of the image impact the remaining photo-sites horizontally from it.
Obviously I never underexpose an image my as much as 5 stops, and the problem doesn't seem to appear when you're 3-stops under...but let's be real! This shouldn't happen at all PERIOD. I think I may be exchanging my 5D4 after I call Canon next week and see what they have to say about it. This could very well be a defect.
Image 1: 5D3 on the left and 5D4 on the right: ISO 50, 5-stops under, pushed 5-stops and 100% shadows
Image 2: 5D3 on the left and 5D4 on the right: ISO 100, 5-stops under, pushed 5-stops and 100% shadows
Image 3: 5D4 ISO 50 on the left and ISO 100 on the right: 5-stops under, pushed 5-stops and 100% shadows
Image 4: 5D4 ISO 50 on the left and ISO 100 on the right: 4-stops under, pushed 5-stops and 100% shadows
Image 5: Zoomed in to show detail on Image 3.
Image 6: Zoomed in to show detail on Image 4.
Just wanted to share my results here and I'll add more information after I speak to Canon.