The body will have more of an effect depending on the amount of light available. Raw speed of the focusing motor is a function of the lens. My 100-400mm actually focuses faster than most of my other lenses, due to the fact is it's a JR. version of Canon's legendary sports lenses.
Andrew Rodgers
Perfected Perspectives -- Photography by Andrew Rodgers | Andrew Rodgers (acedrew) on Twitter | Login | Facebook
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Canon 50D 24mm, 50mm, 100-400mm, 28-135mm
Panasonic Lumix TZ-3 Yeah, I have optical image stabilization and a 10X lens, it also fits in my pocket.
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