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

Started Sep 9, 2016 | Discussions thread
ffabrici Senior Member • Posts: 1,353
Re: Canon 200mm f2 L vs. 200-400mm f4 L

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.

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