Why do lenses need AF calibration?

Started Oct 15, 2003 | Discussions thread
mskad Veteran Member • Posts: 3,329
'Cause it's not a closed/feedback loop (nt)

Radu Tenenbaum wrote:

I've read lots of threads about needing to send body AND lens to
Canon for AF calibration, but I don't understand how the lens could
be out of calibration. After all, isn't the AF system a closed
loop system where the focus is adjusted until the body detects
optimum sharpness?

Also, can someone explain what is involved in performing the body's
AF calibration? Is it firmware or mechanical?

Sorry if this information has already been posted, but there are so
many posts on this topic that it's hard to do a specific enough
search to get me these specific answers.


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