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Metabones Speed Booster developed by Brian Caldwell

General Observations on SpeedBooster Optical Performance

The SpeedBooster is the real deal, but it is not perfect, nor should one look to see peak micro contrast wide open with most lenses, though some perform quite well wide open.

Getting peak performance

Assuming one isn’t after the ultra-fast ~ f/1.0 look, getting peak sharpness and contrast means the same approach as with the lens by itself on its native format: stop down to f/4 - f/5.6 for peak results, and f/8 for more depth of field. There are always possible exceptions for particularly excellent or for mediocre lenses.

The f-stop here is the f-stop with the SpeedBooster, APS-C:

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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.

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  • 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.

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