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.
What I'm wondering is how to separate my lack of technique from the
lenses inability to track focus in this mode. Is this much different
with a really good lens? I assume the "predictive focus" is in the
body, not the lens, but that the cheaper lenses might not adjust focus
as fast? Assuredly, I need to practice, and the lens is capable of
some very nice results, as I've seen in some portraits I've done with
it. (All the way out at "papparazzi" length). It may also be the
case that it a harder time focusing in this mode when the sun went
behind a cloud an the available light diminished, n'est pas?
Probably experience and a $2,000 lens will answer this, but right now
I'm just not sure what to blame on the lens, and what on myself, while
I save pennies for an L series long lens!
Thanks
Ken
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