wiseguy010 wrote:
Lenses just have to focus properly straight out of the box without the need for additional fine tuning by the customer.
If you accept this without any questions, then we have a different opinion about quality. But that was already clear to me.
The problem with this thought, in my opinion, is if I take any wide aperture lens out of the box (Nikon, Sigma) and put it on 5 copies of the same Nikon camera (and the same applies to Canon) it will require slightly different AF on at 2 of the 5 cameras. I do this daily.
So, that makes the problem a camera problem not a lens problem, correct? And therefore the QA issue is with the camera maker?
Except the opposite holds too. If I put 5 copies of a lens on one camera (including Nikon) 2 of them will require MA.
Given the complexity of AF and the quality of sensors we have these days I think reality is we can detect the limits of manufacturing tolerance. I\'m a QA freak and spend my days optically adjusting lenses - but reality is there are QA limits. Nothing can be manufactured in multiple copies identically if you measure carefully enough.
Apr 28, 2013 at 10:21 AM
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