I've heard of the Metabones speed booster, which allows full frame lenses to be used on APC-S bodies. I was wondering if there is one which allows a Nikon FF lens to be used on a Nikon crop body. E.g. 50mm f1.4 ff lens -> 35mm f1/0 equiv. Are there any alternatives to the metabones speedbooster?
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Nikon Speed Booster?