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| p.1 #7 · Defective 5D Mark 3 with Red noise in blacks and shadows? |
Welcome to FM, xopher (your first two posts).
xopher wrote: I sent a sample image to one of my professional friends who also uses the same camera
xopher wrote: If you look at the shadows near the top center part of the picture
I suspect that the camera is not defective. The way to check is to make some side by side shots with someone who has the same camera.
Calgary is a large enough city that somebody on FM in Calgary with a 5D3 must be willing to help out.
If you make shots with the same lens from the same position (two carefully aligned tripods or one tripod with the two cameras aligned by checking the corners of the frame in the viewfinder) with the same ISO, shutter speed, an aperture, then you'll be able to look for differences.
If your technique is really good (using a single tripod in the exact same spot), you'll be able to manually align the images in Photoshop and use the Difference layer treatment, exaggerated by a super S-shaped curve.
Shoot test shots at all ISOs. Use the same aperture for all the shots: f/8. Adjust the shutterspeed as you adjust the ISO. Be sure to have proper exposure (your two posted shots seem to be good in that regard). Use a cable release (remote release) or use the 10 second self-timer. Use mirror lockup. Wait at least 3 seconds after mirror up for vibrations to damp down.
Take it outdoors on a sunny day with the sun behind you or over one shoulder, between the hours of 10 am and 2 pm for the most repeatable consistent constant lighting.
The point of all the rigorous technique is to eliminate as many variables as possible.
No camera is perfect. It is a truism of testing that if you go looking for problems you will find them and then you have to determine how big the problem is and what is the cause -- usually it is experimental error.
I think if I had your camera, based on those images, I would be very happy with the camera. I think if you printed those images quite large (20 x 30 inches) you'd not see your 'problem' and you'd be quite happy with the camera. Pixel peeping at 100% is equivalent to even larger.
What is the largest you have ever printed a DSLR picture?
Can someone in Calgary help xopher do a comparison?