Metabones Speed Booster adapter gives lenses an extra f/stop and nearly full frame focal lengths on APS-C sensors

This is a brief excerpt from DSLR News Shooter

Reported by Mat Gallagher:

The Metabones Speed Booster Adapter (L) next to a regular Metabones EF to NEX adapter

Even as a self-confessed camera geek it is usually difficult for me to get too excited about lens adapters. Yes there are adapters from Novaflex, Kipon and MTF Services that allow you to use old Leica lenses on Sony NEX mount or old OM lenses on Micro Four Thirds. These increase the appeal of the smaller sensor cameras but these are just metal brackets with enough space to correct for the varying flange depths. The new Speed Booster adapter from Metabones, however, offers something unique and exciting. The Speed Booster is essentially an inverse teleconverter (technically a Barlow lens arrangement) to a factor of 0.71x. This means that the image size is reduced by 0.71x, allowing more of it to fit on the smaller sensor, reducing the crop factor and providing more light on the sensor area.

A diagram showing how the Speed Booster optics work

This focal reduction process was not possible with APS-C DSLR’s like the Canon 7D, due to the mirror system. However, interchangeable mirrorless cameras and large sensor video cameras like the NEX FS100, FS700 or …

By: Mat Gallagher

Continued… click here!

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