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| p.1 #5 · Looking for input before buying used 85L v. I |
Haha! So how slow is "still slow" anyway?
Contrary to a popular forumography belief, the AF response depends on a few other important camera-lens-operator factors, not just the maximum AF drive speed of a lens.
However, Canon defines the lens AF drive speed specification as the time it takes from AF to travel from infinity to MFD, and I assume that is at the max speed value of the lens....in the case of 85L MkI it is 1.0 sec. Therefore, 85L MkII should be 0.8 sec.
By comparison, 400 f/5.6 AF drive speed spec is around 0.3+ sec.
Mind you, with prefocusing, any lens may focus fast enough, even 85L or a long lens with 2xTC.
Heck, if prefocusing gets the lens close enough to the actual focusing distance, one might not even need an AF lens, and focus manually instead.