Canon Extenders with 100-400mm II lens

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.


Tony

https://www.flickr.com/photos/wherryman/

  • You're not going to like me. I tried a 1.4 converter with a 100-400mm lens and a Canon 5D II camera and it didn't work on AF. Sorry.

    Our herring gulls are red listed birds.  Think about that the next time you hear some flaming idiot calling for a cull of them.

  • The 1.4 AF works on my 7D2 using that lens Tony, you just start at F8 and you lose AF tracking limiting it to the middle 5 spots.

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  • In reply to Clare:

    Thanks Clare, are you using a MkI or MkII version lens?


    Tony

    https://www.flickr.com/photos/wherryman/

  • It's a Mark II.

    Our herring gulls are red listed birds.  Think about that the next time you hear some flaming idiot calling for a cull of them.

  • 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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    Regards,Tony

    My Flickr Photostream 

  • 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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  • Thank you Clare, Alan, TJ and WJ for your feedback and comments. Not quite sure where to go next but I think I might try to call into Wex on the outskirts of Norwich next Fri on way home from Titchwell and try one out if I can.


    Tony

    https://www.flickr.com/photos/wherryman/