Auto focus comparison between 100 f/2 and 100 f2.8 macro

[Jayson]

Does anyone know if the auto focus is much faster in the f/2 version of this lens? How does the focus speed compare to the 85 f1.8? I alreadyown the 100mm macro and am thinking about the possibility of some indoor sports and a couple weddings coming up. I know I get another stop with the f/2, but really wanted to know if it has a faster focus. I tried to see if Bryan made mention of it, but he only comments that both focus very quickly. Appreciate the assistance.


Jayson

[crosbyharbison]

well I know from experience that the macro has one of the slowest AF sequences that I have ever used. I'd be shocked if the f/2 was slower.

[clemmb]

I have the 100 f2 and my experience is that it is very fast. I only have the 24-105 and several Tamron lenses to compare it to. No experience with the 2.8. I shot this of my daughter at 8:00 in the evening with no flash on my XTi. It was at f2.5 @ 1/1000.


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I have posted this image a few times so some may be tiered of seeing it.


Mark

[Maleko]

Focusing is only slow when you want to focus something from closeup to then something of like infinity! General focusing is very quick.


I find sometimes that when it can't find something to focus on, it goes back and forth like crazy! and i have to manually focus it, then let it autofocus.