500mm f4 II and Extender 2x III ?

Started Jan 31, 2013 | Questions thread
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Re: 500mm f4 II and Extender 2x III ?
In reply to Daniel L, Jan 31, 2013

Daniel L wrote:

If i were to upgrade my 500 IS to newer version of supertele, it's the 600 IS II. I rather have longer supertele with 1.4x than shorter one with 2x. The latter can't do BIF.

"The 2X can't do BIF".  Is it because the 2X (even the mark 3) will drag down AF so much, or because only the center AF point is useable, that makes BIF difficult?

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