Specially designed to work with the Blackmagic Cinema Camera equipped with a Micro 4/3 mount, the Metabones Canon EF to Blackmagic 2.5k Cinema Camera T Speed Booster adapts your full-frame Canon EF lens to work on the smaller sensor of your BMCC by reducing the image circle of the lens to match the BMCC's sensor. The net effect is to cancel out the image crop factor typically observed when using a full-frame lens on a smaller sensor, and to increase the effective speed of the lens by more than one stop. This adapter widens your lens by 0.64x and increases the maximum aperture by one stop and one-third, unlike the standard Metabones MFT adapter which effectively widens the lens by 0.71x and increases the maximum aperture by one stop. This adapter adjusts your camera's crop factor from 2.39x to 1.53x, effectively transforming it into a Super 35 format cinema camera. This adapter features improved internal flocking to reduce internal reflections compared to the previous version. You can also use the adapter on a Blackmagic Designs Pocket Cinema Camera, which has an active MFT mount. When used with a camera with an active MFT mount, the camera powers the adapter; however, when mounted on a camera with a passive MFT mount such as the BMCC or the Digital Bolex D16 MFT, you must use an optional 5 VDC battery connected to the Speed Booster's Micro-USB port. The Speed Booster incorporates a 32-bit processor that supports image stabilisation on compatible IS lenses. Metabones Speed Boosters are manufactured from precision-machined brass with chrome plating on the camera body side and the lens side of the booster to ensure smooth mounting, premium aesthetics and durability. This adapter features a removable tripod foot compatible with Arca Swiss, Markins and Photo Clam ball heads. Note: This adapter is specifically designed for the Blackmagic Designs Cinema Camera with MFT mount. It will also work on a BMPCC, but may damage other cameras using an MFT mount. - Enables mounting of a full-frame Canon EF lens on an optional Blackmagic Cinema Camera, increasing the angle of view by 0.64x and increasing the maximum aperture by one stop and one-third. This reduces the BMCC's full-frame crop factor from 2.39x to 1.53x, essentially transforming it into a Super 35 format cinema camera. - Can be powered by an external 5V Micro USB power supply and features a rotary dial to control the aperture. - Electronic integration of the camera aperture is supported and controlled via the camera body. Autofocus is not supported, but lens-based image stabilisation is supported and EXIF data is communicated. - Third-party EF mount lenses such as those from Sigma, Tamron and Tokina are compatible; however, third-party zoom lenses may require pre-registration with the Speed Booster to detect their maximum aperture. - A high-performance 32-bit processor and efficient switching power supply are integrated, and the Speed Booster is powered by the camera body. - Precise fit and solid connection - the lens has no play, gap or movement once mounted on the Speed Booster and no adjustment is required to fit your lens. Both sides of the Speed Booster, camera side and lens side, are manufactured from precision-machined brass and chrome plated. - The Speed Booster uses a matte black coating to minimise internal reflections to maintain the best possible optical quality with the lens. The exterior features a satin black surface finish. - The Speed Booster features a removable tripod foot compatible with Arca Swiss, Markins and Photo Clam ball heads. Technical Specifications - Lens Mount: Canon EF - Magnification: 0.64x - Interface: 1 x Micro-USB - Tripod Mount: Removable with Arca Swiss compatibility