Canon 200-400 f/4 reviewed by "Chasseur d'Images"

Started Jun 20, 2013 | Discussions thread
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Steve Balcombe Forum Pro • Posts: 11,684
Re: Canon 200-400 f/4 reviewed by "Chasseur d'Images"

Oldvic wrote:

Thanks for quote. Just want to be clear that in above sentence - external 1.4x TC is better or worse than internal 1.4x TC? It doesn’t make sense if external TC actually is better.

That's what I can conclude from the graphs: at f/32, the external converter gives better results than the internal one; at other apertures, there's no difference.

At f/32 diffraction will totally dominate. Any difference which is not seen at larger apertures is just a blip - a statistical fluke or a bad measurement.

Just as a general comment, it's hard to imagine that the internal TC would be any better than the 1.4x MkIII which is stunningly good on the MkII big whites. The point of the internal TC isn't better IQ, it's instant (and weatherproof) availability.

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