500mm f4 II and Extender 2x III ?

Started Jan 31, 2013 | Questions thread
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500mm f4 II and Extender 2x III ?
Jan 31, 2013

I am thinking of upgrading my 500 f4 mark I to mark II, to use with my 5D3, for birding.

The key reason to upgrade is that the 500+5D3 doesn't give me enough reach at times.  I am hoping that the 500 mark 2 will pair better with the Extender mark 3.

However, I heard that with the 2 stops penalty, I can't AF using the 2X extender.  Now if I use the 1.4X extender it will still give me AF but then 700mm isn't much longer than current 500mm and the whole purpose of upgrading is defeated.

So is the increase in range NOT the reason to upgrade?  Will I be better off just getting the 400 2.8 mark 2 so at least it can do AF with the 2X?

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Canon EOS 5D Mark III
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