5D III + Canon 100-400 IS + 1.4 extender? Anyone doing this?

Started Aug 25, 2012 | Discussions thread
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Pieter Van Damme
Regular MemberPosts: 147
5D III + Canon 100-400 IS + 1.4 extender? Anyone doing this?
Aug 25, 2012


I now have a 40D and love the reach with the Canon 100-400 IS attached. In some instances even at 640mm I have needed to crop to get the framing I wanted...

I know the 5D has a lot more pixels, yet I don't know if cropping will give the same result in these extreme situations.

Problem is that the above mentioned combination will not autofocus, so I was wondering if anyone is using it with manual focus? And if so, what are your findings?

Is it worth considering the purchase of the 1.4 extender III for the few occasions in which I'll want the extra reach? And would it be usable?

Any help is much appreciated!

Cheers, Pieter

Canon EOS 40D Canon EOS 5D
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