Came across this article on fujirumors not sure what to make of it because it came out of the blue, maybe there's something to it.
Basically it's an adapter that will increase the light gathering abilities of the lens and restore the equivalent focal length when mounting a FF lens to Aps-C sensor.
A nikon 50mm f1.8 on a fuji x mount with the adapter results in a 35mm f1.2, giving you the same angle of view and Dof as on FF but more Light!!???
Can this be true, how have they kept this a secret, anyone else heard of it/ believe it.
An adaptor which claims to make your lens, faster, wider and better!! This is NOT an April Fool’s! | Philip Bloom
Metabones - Metabones and Caldwell Photographic Introduce Speed Booster