Metabones Nikon G Lens to Blackmagic 2.5k Cinema Camera with Micro 4/3 Speed Booster, Matte-Black Metabones Nikon G to BMCC Micro 4/3 Speed Booster - Front Lens Cap - Rear Lens Cap - Hex Key - Metabones Warranty Industry's best aperture ring covers a 8-stop range with half-stop markings, clearly indicating actual number of f-stops Compatible to both Nikkor G lens & F lens (include non-AI & AI lens mounts) Increase maximum aperture by 11/3 stop (with a maximum output aperture of f/0.80) Increase MTF