7D AF not so good with TC

Started Oct 10, 2011 | Discussions thread
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Pit123
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7D AF not so good with TC
Oct 10, 2011

Hi

I am the happy owner of both a 7D and a 550D. With my 100-400mm, the 550D focus very well even with the Kenko Pro 1.4x TC attached (using center spot AF). Even in dim light the focus is accurate without much hunting.

Not so with the 7D I've tried different focus methods, but they all hunt and do not lock on correctly. Without the TC attached, the 7D focus very well (as expected). I know about the f5.6 limit, but it works so well on the 550D, so I wonder why the different behavior?
Anyone?

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