Since exchanging my backfocussing D7000 for a new copy I have become a bit obsessive about testing the AF to make sure this copy is OK.
I've tried cereal packets, Moire patterns and focus charts (OK, maybe very obsessive).
With my focus-chart tests, I noticed one side of the image behaved differently to the other. So I re-did these tests paying special attention to the placement, height and angle of the camera.
This time, all three of the lenses I tested produced similar results: the left side of the image was slightly backfocussed compared to the right side. For instance:
For now, I have set the AF fine tune for each lens to a compromise adjustment between the two settings.
Assuming my testing is OK & this pattern continues with my other lenses, any thoughts on what may be causing this?
Is this symptomatic of a misaligned main sensor?
Is this grounds for exchanging the camera, or am I being over-critical given the margins involved?
I've tried cereal packets, Moire patterns and focus charts (OK, maybe very obsessive).
With my focus-chart tests, I noticed one side of the image behaved differently to the other. So I re-did these tests paying special attention to the placement, height and angle of the camera.
This time, all three of the lenses I tested produced similar results: the left side of the image was slightly backfocussed compared to the right side. For instance:
- The LHS of my 35 f1.8 needed an adjustment of -8 while the RHS needed -4.
- The LHS of my 17-50 f2.8 needed an adjustment of +1 while the RHS needed +5.
- The LHS of my 35 f2 needed an adjustment of -4 while the RHS needed -1.
For now, I have set the AF fine tune for each lens to a compromise adjustment between the two settings.
Assuming my testing is OK & this pattern continues with my other lenses, any thoughts on what may be causing this?
Is this symptomatic of a misaligned main sensor?
Is this grounds for exchanging the camera, or am I being over-critical given the margins involved?