Advice Before Buying EF 100-400L

Started Jul 18, 2011 | Discussions thread
Regular MemberPosts: 127Gear list
AF question
In reply to Karl Gnter Wnsch, Jul 18, 2011

Karl Gnter Wnsch wrote:

Unless I know that I'll get too close to the subject for my 400mm f/5.6L USM to be able to focus close enough I'll pick the prime over the zoom. It's sharper, focuses faster, is about 1/3rd of a stop faster (in terms of t-stop - in short: it has less transmission losses because of the much smaller number of lens elements)

Interesting point here. I've read several references here from people with both lenses that disabling IS on the 100-400 will dramatically increase AF speed/quality and put it on par with the 400 prime. I have tested the AF, but not seen a massive improvement from this change.

Have you tried/seen this effect?

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Canon EOS 7D Canon EF-S 55-250mm f/4-5.6 IS II
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