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Canon 200mm f2 L vs. 200-400mm f4 L

Started Sep 9, 2016 | Discussions thread
OP Ran Plett Senior Member • Posts: 1,051
Re: Canon 200mm f2 L vs. 200-400mm f4 L

ffabrici wrote:

I have done extensive testing of the four version II and III, 1.4x and 2x converters and conluded that I don't appreciate the results of the 2x converters, even on one of the absolutely sharpest lenses that Canon produces; the 300L II. Cropping using a 1.4x III converter gives me the exact same resolution on a 5D mkIII as using the 2x III converter.

objektivtest.se has done somme great MTF tests of the Canon converters and conludes that with the version III converters on an FF camera, the 300L II looses around 10% MTF (contrast/resolution) using the 1.4x and around 20% using the 2x converter.

My 70-200L II, 100-400L II, 300L II and 800L all produce really great results with the 1.4x III converter on both FF and crop.

That's really interesting. No doubt there would be a loss in resolution, but when you say using the teleconvertors gives a loss of 10% and 20% resolution, would that be calculated after the increase in FL has been taken into account?
Now I've got to go and test my lenses to see if there really is any point to having that 2x teleconvertor. If not, I'll sell it.

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