Mounted between a mirrorless camera and a SLR lens, Speed Booster® increases maximum aperture (hence its name), increases MTF and makes lens wider. Optics designed by Caldwell Photographic in the USA (patent pending).

Sony NEX Speed Booster® Adapters are NOT fully compatible with full-frame Sony A7, A7R or A7S. When Speed Booster® is used with Sony A7 or A7R, the camera is required to be used in "APS-C Size Capture" mode.

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