Samuel H
Major Contributor
There are speed booster adapters for NEX and Fuji-X ( http://www.metabones.com/product/speed-booster ). Everybody's guess is that m43 is next.
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Not a huge deal if the metabones thing works fine, though (it turns the BMC and it's 2.3x crop factor into APS-C or 1.63x crop factor).