At long last the Canon EF to Micro 43 speedbooster has been announced. While it has been available in a Nikon lens version for some time, the Canon version has electronic pass-through which will allow aperture & IS to be used with this speedbooster. The adapter will yield a .71x crop factor and give you a 1 stop advantage for mirrorless cameras such as the Panasonic GH4. This is a welcome addition and will make many GH4 owners (like myself) very happy.
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