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Canon 70-200 L zooms + EF Extender III 1.4X

Let’s see how the Canon EF 1.4X Extender performs on Canon’s two “L” zooms:

The focal length with the Extender 1.4X zoomed to 200mm is a nominal 280mm, but the two zooms don’t agree on what 200mm is (both zoomed to the 200mm mark), so the actual sizes are slightly different.

I chose to test at 200mm zoom setting, because that best represents the most likely use of a teleconverter on the 70-200 zoom— the long end of the zoom range. Performance could differ somewhat at other focal lengths, but I deem that a less common usage than the use case of trying to move beyond 200mm.

Test scene

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Canon 5DMark II + 70-200mm f/2.8L IS II + EF Extender 1.4X

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