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Metabones EF to EF-M T Speed Booster ULTRA 0.71x adapter improves aperture, sharpness, and reduces crop factor for Canon EOS M with EF lenses.
Metabones EF to EF-M T Speed Booster ULTRA 0.71x (EOS M)
Product ID: 52172
SKU: 52172
Condition: New product
Manufacturer: Metabones
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| Type of Product | Adapters for lens |
| Adapter is for cameras | Canon EF - MFT |
| Adapter is for lenses | Canon EF |
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Product details
Optical Features
- Advanced 5-element/4-group optical design incorporating ultra-high index tantalum-based optical glass by Caldwell Photographic (USA) for extraordinary optical performance.
- Improved corner sharpness, reduced distortion, and minimized vignetting.
- Increases maximum aperture by 1 stop, achieving a maximum output aperture of f/0.9.
- Makes lenses 0.71x wider, effectively reducing crop factor on APS-C mirrorless cameras.
- Enhances MTF (modulation transfer function) for improved detail resolution.
Electronic Features
- Supports autofocus with speed adjusted for shorter focal length and brighter aperture.
- Focal length and aperture information are adjusted and recorded in EXIF data.
- Supports image stabilization (IS) lenses and Video Digital IS on compatible camera bodies.
- Stores EXIF data (lens name, focal length, maximum/minimum aperture) for one manual lens in the adapter.
- LED indicator displays communication status between lens and camera.
- Powered by the camera body; no external power source required for most lenses.
Mechanical Features
- Detachable tripod foot compatible with Arca Swiss, Markins, and Photo Clam ball heads.
- Internal flocking reduces reflections inside the adapter.
- Rubber gasket protects EF-M mount connection from dust and moisture.
- Constructed from aluminum alloy and brass with chromium plating for durability.
- Satin surface finish for a professional look and feel.
Performance and Compatibility
The Speed Booster ULTRA 0.71x effectively reduces the crop factor of APS-C mirrorless cameras (such as Canon EOS M series) from 1.5x to approximately 1.07x. It is optimized for use with virtually all full-frame SLR lenses regardless of exit pupil distance, including professional-grade f/2.8 zoom lenses (e.g., Canon/Nikon 24-70mm f/2.8 and 70-200mm f/2.8), transforming them into faster, wider lenses (e.g., 17-50mm f/2.0 and 50-142mm f/2.0 equivalents). High-speed prime lenses like a 50mm f/1.2 become approximately 35.5mm f/0.9 with excellent contrast and resolution across the frame.
Compatible Lenses
- Canon EOS M series cameras
- Canon EF-mount lenses
- Canon EF extenders (teleconverters)
- Carl Zeiss EF-mount lenses (see notes)
- Sigma EF-mount lenses (see notes)
- Tamron EF-mount lenses (see notes)
- Tokina EF-mount lenses (see notes)
- Contax N mount lenses modified to Canon EF by Conurus
- Contax 645 NAM-1 adapter modified to Canon EF by Conurus
Unsupported Lenses and Notes
- Canon EF-S lenses do not fit; some may be modified at user risk.
- Third-party APS-C lenses only work with cropped 4K video mode on EOS M50; insufficient coverage for stills or full HD video with Speed Booster.
- Lens correction features such as peripheral shading, chromatic aberration, and distortion are not supported.
- Focus confirmation chips (e.g., Dandelion) are unsupported.
- M42 screw mount adapters may damage the Speed Booster and/or camera if improperly made.
- Stacking non-Metabones/non-Conurus adapters is not supported; some manual focus lenses with rear protrusions require modification to avoid damage.
Additional Notes on Aperture Reporting
For fast lenses (faster than f/1.4), the camera displays the pre-boost aperture rather than the boosted aperture. For example, an EF 85mm f/1.2L lens attached will show f/1.2 on the camera, but the physical combined aperture with the Speed Booster is approximately f/0.85. Slow lenses report the boosted aperture directly.
