Canon 300mm f/4 with canon 1.4 or 2X extender (mk3 vs mk2) or 100-400mm

Started Jul 2, 2013 | Questions thread
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dhogaza Regular Member • Posts: 343
Re: Canon 300mm f/4 with canon 1.4 or 2X extender (mk3 vs mk2) or 100-400mm

Steve Balcombe wrote:

DGways wrote:

Thanks, can anyone vouch for the autofocus speed of the 300 f/4 with the 1.4x teleconverter (mk2 or mk3 specifically)?

I used mine with the Kenko Pro 300 DG 1.4x, which is for all practical purposes a clone of the Canon MkII. Autofocus speed is very acceptable.

It's fine with the Canon 1.4x (original version).  It was certainly good enough for me to nail that burrowing owl flying at me with a beetle in its mouth!

Fast enough to catch these, too ...

Cliff Swallow, 300/4 IS + 1.4x, Malheur NWR, OR, late May 2013

As I understand it, the additional electronics in the MkIII only work with the MkII big whites

And a subset of bodies, too ...

, so on the 300/4L IS the MkIII AF performance should be the same as the MkII.

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