Struggling with D7100

Started Feb 9, 2014 | Questions thread
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Re: Struggling with D7100
In reply to nfpotter, Feb 10, 2014

nfpotter wrote:

First, whether you're tuning a prime or zoom lens, results can vary MASSIVELY depending on what target and distance you're using. Second, if you're tuning a zoom lens, you WILL get different results (if tested correctly) at different zoom lengths. Third, you may get very different results under different lighting conditions, and/or with different focus targets.

The reason one can get different tuning results for different targets, focus distances, focal lengths, and lighting is that the AF system produces different results for those conditions. In other words, situational variance in tuning values is reflecting the variance of the phase detect mechanism itself.

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