Let’s see how the Canon EF 2X Extender performs on Canon’s two “L” zooms:
- 70-200mm f/4L IS @ 200mm + 2X Extender
- 70-200mm f/2.8L IS II @ 200mm + 2X Extender
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.
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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