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Canon 70-200 L zooms + EF Extender III 2X

Let’s see how the Canon EF 2X Extender performs on Canon’s two “L” zooms:

The focal length with the Extender 2X zoomed to 200mm is a nominal 400mm, but the two zooms don’t agree on what 200mm is (both zoomed to the 200mm mark), so the actual sizes are slightly different.

Magnifying errors

Any lens which is not assembled with precision will have optical symmetry or centering errors which a 2X converter will of course magnify by 2X, making visible optical issues that might be subtle to see without the extender.

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Since 2006, Diglloyd Advanced Photography is the authoritative review and reference for DSLRs and their lenses: Canon and Nikon primarily, but also Pentax and some medium format. Reviews of key DSLRs are included, but the primary focus is on lens performance. Also included is a wealth of technique and workflow approaches.

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