Metabones EF-MFT Speed Booster Ultra 0.71X.

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The Metabones EF-MFT Speed Booster Ultra 0.71X adapter lets you mount your Canon EF lenses to any Micro Four Thirds camera, with full electronic communication. Autofocus function isn't the best, but you do get aperture control and other functions which will vary by lens. This adapter also provides a 0.71 magnification factor to any lens, so you get a bit less of a lens crop- and as a fun bonus, you'll gain a stop of light, too. In excellent condition, with original case.
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