7 lens elements in 4 groups for optical clarity as well as color fidelity.Provides a 1.33-stop increase for the camera over the lens's aperture range.Maximizes apparent angle of view of combined camera and lens.Allows a full-frame Canon EF-mount lens to be used with a Blackmagic Design Pocket Cinema Camera 4K MFT-mount camera.They cannot be attached to any other M43 cameras such as JVC, Olympus or Panasonic cameras. Metabones Canon EF to BMPCC4K Speed Booster adapters are designed exclusively for Blackmagic Design Pocket Cinema Camera 4K (BMPCC4K). The BMPCC4K Speed Booster XL 0.64x reduces the crop factor of the BMPCC 4K camera from 2.02x to 1.29x. The BMPCC4K Speed Booster ULTRA 0.71x and XL 0.64x are similar to the standard M43 Speed Booster adapters (MB_SPEF-m43-BT3 and MB_SPEF-m43-BT4) but the optics have been re-designed to optimize for the filter stack thickness of 2.4mm found in Blackmagic cameras rather than the 4mm of a standard Micro Four Thirds. While doing so, the adapter's optics help to maximize the connected lens's apparent angle of view while providing a 1.33-stop increase for the camera over the lens's aperture range. The Metabones Canon EF to MFT BMPCC4K T Speed Booster XL 0.64x (Black) MB-161 allows a full-frame Canon EF-mount lens to be mounted onto a Blackmagic Design Pocket Cinema Camera 4K MFT-mount camera.
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