ICMP,
Thanks for the nice words.
I used the 100mm Macro primarily for macro work as I had other
lenses better suited to me personally for the portraits I shoot
(the Canon 70-200 IS is my first choice). However, if I had the 100
macro mounted, I didn't pass up any chances.
Regarding autofocus, I don't remember it being an issue. I did not
use the lens for action sports, but autofocus seemed fine to me. If
you go from 1:1 macro out to infinity, I'm sure there will be a
lag. Just use the limiting switch to help with that.
The 100mm focuses MUCH faster than the 180mm macro - that I can say
for sure.
The Canon 85 is better suited than the 100mm Macro for low
available light work - faster apertures are their advantage here.
Still, f/2.8 is not shabby. I have not personally used the 100mm
f/2.0 - it has a good reputation though.
Let me know if you have any more questions!
http://www.the-digital-picture.com/Reviews/Canon-EF-100mm-f-2.8-USM-Macro-Lens-Review.aspx
http://www.the-digital-picture.com/Reviews/Canon-EF-85mm-f-1.8-USM-Lens-Review.aspx
Regards,
Bryan
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