> On Sat, 13 Jan 2001, Karen Nakamura wrote:
> > I have an EOS-3 with the 75-300mm F4-5.6 IS lens. I can tell
> > you that the focus tracking on that lens is pretty spectacularly
> > bad, even with a high-end body. The poor motor just isn't fast
> Your make an interesting observation that the EOS 3 doesn't AF
> well with a lens slower than f/4! I think the central sensor
> only detects horizontal lines when using your 75-300 lens or
> the 28-135 IS
I remember similar kind of sitution in one of the finnish
newsgroups. There was this person who was disapointed to
eos 3 and 75-300's AF. He had switched from eos50 to eos3
and said that in the long end eos50 had better AF. Only
explanation we could come up with was that when you go
long enough, the minimum aperature of 75-300 goes over f/4.
with eos50, the cetral sensors are cross type even at f/5.6,
but with eos3 they are only vertical (or was it horizontal)
type, not cross type. That affects AF a lot. so with eos3
you need better/faster glass to fully utilize the body
where eos50 can do with slower class and actually is
in this matter better than high-end eos3 body.
So bottom line is that if you photograph fast moving objects
and don't have fast glass, eos3 might not be the right
body for you. Instead you'd get better results with
less pro body.
-Jani
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