Chuck Norcutt wrote:
> I've never had any focusing problems that I thought could be attributed
> to the 5D but (and these may be a biggies) I only ever use center point
> autofocus in single-shot mode, I have the autofocus button removed from
> the shutter button and moved to the back of the camera and (perhaps the
> real biggie) up until a couple of weeks ago I have only had f/2.8
> constant aperture lenses.
Yeah, he tends to use predictive AF (I *think* that's what Canon calls
it), especially with big zooms, for birds in flight and such.
> My latest acquisition, a Tamron 20-40/2.7-3.5
> is obviously slower on the long end but I haven't used it enough to know
> if it makes a difference to low light/low contrast focusing or not. So,
> what's the speed of the lenses on your buddies 5D?
They would vary. He's got a bloody big Sigma zoom telephoto (looks like
a rocket launcher to me), as well as several Canon and third-party lenses.
Garth
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