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      08-22-2011, 10:14 AM   #1368
First Lieutenant

Drives: ///M5
Join Date: Nov 2007
Location: NW PA

iTrader: (2)

Originally Posted by The1 View Post
I don't find AI servo the most usefull focusing mode, so may not be the best indicator depending on camera body.

I've taken lots of pictures where i was focusing on an animals head and gotten it's tail in focus with AI servo... it's just too sow to keep up.

The 7D has a much more acurate system, but i've never taken the time to bother testing it, just because i don't like shooting with it activated.

p.s. I've never heard a lens make a clicking type noise like that. the Non-usm lenses are lounder, but they don't sound like a machine gun with no bullets in it.
I've been pretty successful using AI servo in the past with other lenses. I only use it when tracking moving subjects, though.

My nifty-fifty isn't as loud as this thing is. I'm waiting to see if the guy can come up with the receipt before sending it off to Tokina for evaluation/repair.