I was invited yesterday to the dealer’s shop in Eindhoven (the Netherlands) where i could swap my Canon 7D body for a new one! My week-long discussion with both the dealer and Canon have been fruitful, eventually.
After providing the visual proof, that my camera performed poorly compared to other 7D’s, the problem was confirmed and a swap granted.
Same firmware i must say, but the noise and pattern-noise at low ISO problem is solved in this model.
This confirms my earlier suspicion that it is a quality-check/in-factory calibration issue, that’s not going to be solved by a firmware update. My final conclusion is: faulty calibration of the green-channel in some cameras, as well as misconfiguration of the Highlight Priority mechanism results in pattern noise at all ISOs, but more obvious in low-noise pictures. Solution: try to swap your camera for another one (test in store please) and/or switch off the Highlight Priority function. I have opted for the first solution.
Now that’s all cleared, i am anxiously waiting for the firmware update that, as promissed to me by Canon via email, addresses the remaining problem of frame stutter if bright patches appear in the picture. The new body still exposes this problem from time to time. I solve this now by repairing the frames in FCP with Joe’s filters.
End good all good! (?) Let’s wait for the last part (firmware) but i am a much happier and confident man already.. 😉
Special thanks to City Foto Eindhoven for taking the complaint serious, and for all their trouble!