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      08-22-2011, 09:29 AM   #1367
Major General

Drives: white 135
Join Date: Aug 2010
Location: KW ontario/vancouver temporarily

iTrader: (0)

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.