I am thinking of buying either the 1.4 or x2 extender to go with my EOS90D and 100-400mm II lens . Looking on line I am confused by which would be the best option to keep using AF rather than MF. Does anyone have any experience using this lens and extender combo?
All thoughts, comments & suggestions welcome. Thanks.
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In reply to Clare:
As Alan has said the 1.4x extender works with the 100-400 Mk 2 connected to the 7D Mk II BUT you are restricted to single centre point focus AND a maximum aperture of f8 at full zoom.
According to this article I found I think the same is true if you connect it to the 90D.
I'm afraid I've no idea whether a 2x extender would work with this set up. WEX used to have a chart which indicated what extenders worked with which lenses and cameras but I can't find it.
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Older Canon bodies will only AF at f/5.6, newer ones will do so at f/8 (but with limited AF points). That means you'll get some AF with the 90D (but not with Clare's 5D2) and the 100-400 + 1.4x. You won't get AF with the 2x however as that will be 800mm f/11. It WILL AF if you use Liveview should that be useful, though the results are not brilliant (generally speaking, I'd only use the 2x on the best prime lenses, the results are noticeably softer with the 2x).
One of the threads I did a while ago pitched some lenses & converters against each other & may help you a bit
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