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Canon Extenders II vs III

Started Jun 13, 2011 | Discussions thread
40d_dane Senior Member • Posts: 1,034
Improved AF performance

According to the newest CPN newsletter, the mk III extenders does improve AF speed on earlier EF lenses:

http://cpn.canon-europe.com/content/education/technical/latest_ef_lens.do

This is in contradiction to what Canon has previously claimed (only AF improvements on the mk II lenses). I do have AF issues when I use my 1.4x mk I extender on my 500mm + 7D (probably AF speed issues, optically the combination is hard to fault), so I am seriously considering getting a 1.4x mk III to check it out.

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