
I would have assumed the AF would be fine as well seeing as I've used a few HSM lenses and have been very impressed with the results. The nice fact of the 100-300 is I can get a brand new one here in Canada for half the price of the 100-400 leaving me room for some other items. I'll have to see if one of the local camera shops has a 100-300 available to test and see how the AI Servo does tracking fast moving objects.
Cheers,
Shawn
Well, I know alot of people with this lens, I can't say i've ever seen one where it's missed focus, even on a crop body..