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7D and 1.4 extender

Started Apr 11, 2010 | Discussions thread
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Terry Straehley
Contributing MemberPosts: 900
7D and 1.4 extender
Apr 11, 2010

I went shopping for a Canon 1.4 extender recently which I bought to use with my 20D and 70-200 lens. At some point, I would like to upgrade the 20D to a 7D or next in that class. On the B&H web site, I saw the following notice. Autofocus will not work on 7D due to the reduced amount of light when extending long lenses.

This seemed very strange to me, since the 7D is supposed to have a very good autofocus system.

I checked the previous posts and at least one person talked about having a 7D and 1.4, but his email wasn't available, so I couldn't contact him directly.

I would appreciate anyone using the 1.4 with a 7D replying with their experience with autofocus. I know that it does slow autofocus, but totally not work?
Thanks in advance.
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