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Canon EF 1.4x III
Teleconverter, Canon EF
Questions about Canon EF 1.4x III
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I don't know exactly, but I don't think so. I use the combination EF and M. It works. You can get an answer to this question at the Canon Shop.
Yes, of course. But it is only suitable for a few purposes.
No. Canon teleconverters are only compatible with a few Canon lenses.
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As the previous speaker wrote: the 2x converter costs you more light and also some sharpness? If you need the focal length (200x2x1.6=520mm KB equivalent), then take the 2x. If you don't need it, then I would go for the 1.4x. With the 2.8 output aperture you won't get problems with the autofocus that quickly. Two f-stops from 2.8 is 5.6 and that should not be a problem. There are overviews of which focus fields work in which camera-lens-converter combination. You can find them in the manual for the 80D from page 128 onwards. The focus areas do not differ (both group B).
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Not combatable according to canon
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