My last two weddings I have noticed some slightly out of focus shots
for no reason that I could understand. Using flash, fast enough shutter
speed, it just made no sense to me. I use a 1Ds with 24 - 70L lens.
Well, in testing today to try to recreate the problem, I finally
realized what I have been doing. While adjusting the zoom ring with my
left hand, my index finger naturally rests on the bottom of the FOCUS
ring. While test shooting today I felt the slight turn of the ridged
focus ring with my index finger after the auto focus had already set.
So *I* have been causing the focus problem. It is almost impossible for
me to use the lens without my finger brushing against that damn focus
ring, but I will just have to train myself to STAY AWAY FROM IT. Sure
wish Canon would provide some type of lock to prevent accidental manual
adjustment of focus.
Steve
living and learning
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