Speed Booster by Metabones
S Speed Booster
Speed Booster increase the brightness of your lens.
The Speed Booster by Metabones increase the brightness of your lens in one Stop. Mounted between a mirrorless camera and a SLR lens, Speed Booster™ increases maximum aperture by 1 stop, so your f/2.0 lens becomes an f/1.4 lenses and also increases MFT and makes lens wider by a factor of 0.71x.
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