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 enough or smart enough to
lock onto targets. I usually switch to manual focusing when I'm out on the
300mm end.
I've been greatly disappointed by the softness of this lens at 300mm. Sigh.
Karen
At 9:44 PM -0800 1/12/01, Ken Durling wrote:
>HI folks -
>
>Today I shot a few rolls chasing Herons, and when I got the slides
>back ( I tried out E100VS and RSX II 100 for the first time) I noticed
>something: I was shooting with the "consumer-grade" 75-300mm 4-5.6
>III USM lens and mostly all the way out at 300mm. I pretty much kept
>it on AI servo focus, and continuous drive (3.5/sec in AI Servo on the
>Elan 7) as these beasts were prone to doing spectacular take-offs when
>I got much closer than 10 feet! ;-) Well, what I notice in the
>slides is that the shots I took by holding down the shutter and firing
>away while tracking their flight are noticably out of focus. I can
>see the limitations (I think) of the lens even in the still shots, but
>the moving ones are considerably worse. Some more than others.
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