Metabones SPEF-EFM-BT1 – Canon EF to Canon EF-M (EOS M) T Speed Booster ULTRA 0.71x

Metabones SPEF-EFM-BT1 – Canon EF to Canon EF-M (EOS M) T Speed Booster ULTRA 0.71x

Focal reducer for mounting full-frame Canon EF lenses on Canon EOS M mirrorless cameras, with autofocus and EXIF data. It makes the lens 0.71x wider and adds 1 stop of light, up to f/0.9 output.

Features

• Increases the maximum aperture of the lens by 1 stop, up to f/0.9 output
• Increases the MTF of the attached lens
• Makes the lens 0.71x wider
• Patented 5-element/4-group optical design with ultra-high index tantalum-based glass by Caldwell Photographic (USA)
• Autofocus with speed adjusted for the shorter focal length and brighter maximum aperture
• Focal length and aperture adjusted in the EXIF data
• Image stabilisation (IS) lens support
• Video Digital IS support (on supported camera bodies)
• Stores EXIF data (lens name, focal length, maximum/minimum aperture) for one manual lens in the adapter
• LED indicator showing communication status
• Powered by the camera body: no external power needed with most lenses
• Detachable tripod foot compatible with Arca Swiss, Markins and Photo Clam ball heads
• Felt-flocked interior to reduce internal reflections
• Rubber gasket protects the EF-M connection from dust and moisture
• Aluminium alloy and brass construction with chrome plating
• Satin surface finish

Note: EF-S lenses do not fit. Third-party APS-C lenses only cover the cropped 4K video mode of the EOS M50. With lenses faster than f/1.4 the camera shows the pre-boost aperture. Some manual lenses with rear protrusions (e.g. OM 28/2.8, OM 50/1.8, Leica R 15/3.5) must be modified before use.

Specifications