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moon shot with ef600 f4II

Started Oct 12, 2013 | User reviews thread
Schwany
Schwany Forum Pro • Posts: 10,169
Could this be true about ef600 f4II?

Heard this yesterday.

The 600f4 II plus 1.4x extender don't work optimally on a 1DMkIV or any older body. By this I mean focus speed, accuracy, and resulting image quality. Apparently that combo works much better on a 5DMkIII or 1DX with almost zero degradation when using a 1.4x III extender.

Yes that is the stuff interweb BS and mythology comes from, but I did hear it while talking to someone about longer than 500mm lenses. Can't confirm it. Don't you have a 1DX now. If so, you could check to see if that is true.

 Schwany's gear list:Schwany's gear list
Canon EOS-1Ds Mark II Canon EOS 5D Mark II Canon EOS-1D Mark IV Canon EOS-1D X Canon EOS 5D Mark IV +14 more
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