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EXCERPT page containing first few paragraphs. 2022-01-22 22:22:25

Metabones Speed Booster developed by Brian Caldwell

Metabones SpeedBooster — How It Works

The Metabones SpeedBooster* optically reduces the projected image from a lens designed for a larger sensor to a smaller image that covers a smaller sensor (“focal length reducer”).

Since by definition f-stop is a function of focal length, a .7x Reduction in focal length equates to a one-stop increase in f-stop: f1.4 becomes f/1.0, f/2 becomes f/1.4, etc. But the SpeedBooster also increases MTF, which means in general that image quality ought to be higher than an adapter which performs no optical reduction.

The SpeedBooster focal length reduction is made possible by a short flange focal distance which allows an adapter to go in between the DSLR lens and the body. Cameras such as Sony NEX, Fuji X, and the Olympus E-M5 (MFT) work for this reason. But it will NOT work on any DSLR because of the mirror box and the distances/offsets involved.

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Want a preview? Click on any page below to see an excerpt as well as extensive blog coverage, for example on Sony.

Optical path for Metabones SpeedDoubler
Image circle before and after reduction by Metabones SpeedBooster

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