I seem to have better luck getting good focus every other shot when a subject 
is coming towards me. Center spot or 5 point makes little difference. The 
camera isn't ready on the first shot and hasn't figured out how fast the 
subject is moving. Hits it on the second, overshoots the focus on the third, 
settles in pretty much after that. If you need the first image in a rapid fire 
mode to be sharp, start holding the AF button down a second or three as the 
subject approaches, then start shooting.

Not claiming these are foolproof or will work for everything, but for running 
dogs, it works for me.


On Nov 26, 2012, at 11:53 , Christine Nielsen wrote:

> Thanks, Don.
> Yes, it's the runners coming straight at me that I have the most
> trouble keeping in focus.  On my first outing with this lens,
> especially... it seemed like the focus was always just over the
> shoulder of the person I was trying to catch.  More diligent technique
> helps... But I'll confess to wondering about how a "better" AF system
> (more points, faster) would handle in this type of situation.  Ah
> well.  Maybe someday, I'll find out... until then, I'll be working on
> improving my end of the equation. Besides, no other system is any
> smaller or lighter, that's for sure.


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