At the moment, the best converter for EF lenses

At the moment, the best converter for EF lenses

Kenko KE-MC4DX1C DGX MC4 Canon AF converter 1.4x (Electronics)
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Customer Review

The most important first:
It is compatible with all EF lenses with port (ie also to all L lenses)

The optical properties are very good. The converter is in a league to the much more expensive Canon converters and fits also as I said to all Canon EF lenses with port. CAUTION: Do not however to lenses with EF-S connection !!!

As currently said the best converter on the market. The loss of resolution here is limited to only 166 pairs of lines between the enlarged center and 245 at the edge, which is a very good value. (For Canon Vergelich 1.4 betw. 170 and 290).

The 1.4x converter reduce light output by one f-stop.

At my 600D and 6D I could not notice any problems with the AF, as you would expect.

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