EXCERPT page containing first few paragraphs. 2024-04-25 03:52:49
UA_SEARCH_BOT_compatible_botmozilla/5.0 applewebkit/537.36 (khtml, like gecko; compatible; claudebot/1.0; +claudebot@anthropic.com) @ 3.145.59.187
For full access, subscribe here. Or click title to login. 
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.
Article continues for subscribers...
Diglloyd Guide to Mirrorless is by yearly subscription. Subscribe now for about 25 cents a day ($90/year).
BEST DEAL: get full access to ALL 8 PUBLICATIONS for only about 75 cents a day!
Diglloyd Guide to Mirrorless offers comprehensive integrated coverage of most APS-C and full frame mirrorless cameras and lenses.
Special emphasis is placed on Sony full-frame, including Sony lenses and the high performance Zeiss Batis and Zeiss Loxia lenses plus Rokinon/Samyang and others. Fujifilm X, Olympus and Panasonic M4/3, Sigma dp Merrill and dp/sd Quattro are also covered in depth. Years in the making, it offers a wealth of material for choosing and using a mirrorless camera.
- Make better images by learning how to get the best results right away. For example, the best way to set up your Sony camera.
- Save money by choosing the right lens for your needs the first time, particularly with the numerous lenses available for Sony.
- Make better images, a sort of “cheat sheet” saving yourself months or years of ad-hoc learning—best practices and how-to and processing parameters are discussed and shown.
- Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to full camera resolution, plus large crops.
- Real world examples with insights found nowhere else. Make sharper images just by understanding lens behavior you won’t read about elsewhere.
- Aperture series from wide open through stopped down, showing the full range of lens performance and bokeh.
- Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.
Want a preview? Click on any page below to see an excerpt as well as extensive blog coverage, for example on Sony.
