Metabones EF-BMPCC4K T Speed Booster Ultra 0.71x rear with built-in diaphragms

with built-in diaphragms

which can be removed and transported separately when you don't need the full Pelican deal (case interior measures approximately 14x29x42cm)

The Nikon 400mm f3

and some weather resistance for

but it does not work at all

Metabones EF-BMPCC4K T Speed Booster Ultra 0.71x rear with built-in diaphragmsThe Metabones EF BMPCC4K T Speed Booster Ultra 0. 71x is a Speed Booster designed specifically for the Blackmagic Pocket Cinema Camera 4K. Takes Canon EF mount lenses and provides an extra stop of effective aperture, plus a 0. 71x field of view expansion. In excellent condition, with minor cosmetic wear, clean glass, good function. UNBELIEVABLY IMPORTANT: THIS ADAPTER IS FOR THE BLACKMAGIC POCKET CINEMA CAMERA 4K ONLY. DO NOT USE IT ON ANY OTHER