The Metabones Canon EF to Sony E T Speed Booster Ultra is a focal reducer adapter that lets you mount Canon EF lenses on Sony E-mount cameras, compressing the image circle to give you a wider field of view and more light compared to a standard adapter.
What does a Speed Booster actually do?
Unlike a simple dumb adapter, a Speed Booster contains optical elements that reduce the focal length and increase the maximum aperture of the attached lens. Mount a Canon EF 50mm f/1.4, for example, and the combination behaves as a wider, faster lens on your Sony body — making it especially useful on APS-C Sony cameras where crop factor would otherwise cost you field of view.
Electronic communication
The "T" in the name indicates that this adapter includes electronic contacts between lens and camera, so autofocus, image stabilisation and EXIF data all continue to function. This sets it apart from purely mechanical adapters where you lose all electronic control.
Who is this for?
If you're switching from a Canon DSLR system to Sony mirrorless and want to keep using your EF glass — or if you shoot on an APS-C Sony body and want to recover that full-frame field of view — a used Metabones Speed Booster Ultra is one of the most practical bridges between the two systems. It also pairs well with Sony Alpha bodies like the Sony Alpha 7 series or APS-C cameras such as the Sony Alpha 6700 when using larger EF zoom lenses.
Buying used
A second-hand Metabones Speed Booster Ultra comes with a minimum 12 months warranty and is individually inspected before sale. The optical elements are the key thing to check — any haze or dust on the internal glass will affect image quality, which is why professional inspection matters on pre-owned focal reducers.
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