200-400 VR does not equal prime lens sharpness?

Started Nov 2, 2006 | Discussions thread
wilkman Senior Member • Posts: 1,872
you're very welcome

Hey did you notice any AF speed difference? Do you think prime+TC
would be better AF? or do you know anything about 500mm f/4 AF-S?
If you do is there any AF speed difference between 500/4 and
200-400/4?

Yes, there is a considerable difference in the AF between any of the primes, 200, 300, or 400, and the zoom. After shooting the primes, I always feel like I'm waiting on the zoom. But sometimes, I actually need to slow down the primes tendancy to jump off target when I'm not framing carefully enough. In such circumstances, I'll use 'lock on' set to normal for the primes, but leave it off for the zoom.

I have no experience with the 500mm .... maybe somebody will chime in.

My guess is its AF speed is more kin to the zoom than the primes. f4 is f4 is my thinking.

best, mark

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