Metabones Canon EF Lens to Blackmagic Pocket Cinema Camera T Speed Booster (MB_SPEF-BMPCC-BT1) 4PC Accessory Kit Includes Lens Pen + Dust Blower + Cap Keeper + Microfiber Cleaning Cloth Fits Canon EF Lens to BMPCC MFT Mount; Reduces Crop Factor to 1.75x Increases Maximum Aperture by 1 2/3 Stop; Built-In Aperture Control Electronics Aperture is Set Using Camera Buttons; 32-Bit Processor Efficient Switched-Mode Power Supply; Powered by Camera Body Removable Arca-Type Tripod Foot