Posted by Dave Kendricken on January 14, 2013 •
"There’s more than one way to get a lens on a camera it shouldn’t naturally fit, particularly when adaptation has to go beyond mere lens mount disparity and extends all the way to major sensor size differences. Of course, in approximately none such case does the adapter getting the job done actually widen field of view, improve clarity and sharpness, and increase exposure levels by up to one full stop. In fact, to expect as much (and all in one device) would seem to equate to madness — especially if such a device supports electronic lens control. This is not the short and skinny of the new Tom Cruise sci-fi/action film, but that of the Metabones Speed Booster. The adapter not only mounts your Canon full frame 50mm f/1.8 lens, for instance, to your Sony FS100 — but also turns it into a sharper 35mm f/1.2 in the process.
Despite being called the Speed Booster, this device does a lot impressive optical and electronic things to the benefit of any attempting to bridge the gap between, say, a strong Canon stills lens collection and the modern Super35-sized video cameras being proliferated by Sony. Metabones is also offering several other variations and combinations on their site, including adaptation from Leica R lenses to Fuji X cameras. Below is a video review from Bryant Naro which accompanies his writeup on the Speed Booster, which also has this to say:"
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Via Thierry Saint-Paul