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Metabones Canon EF Lens to Sony NEX Speed Booster ULTRA- MB_SPEF-E-BM2

Metabones Canon EF Lens to Sony NEX Speed Booster ULTRA- MB_SPEF-E-BM2


Part Number: MB_SPEF-E-BM2
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Like the revolutionary original Metabones Speed Booster announced in January 2013, the Speed Booster ULTRA has a magnification of 0.71x, and so it effectively reduces the crop factor of mirrorless cameras with DX-sized sensors, such as Sony E-mount and Fuji X-mount cameras, from 1.5x to 1.07x. However, the new ULTRA design makes very effective use of exotic materials at the furthest limit of glassmaking technology, and as a result is well corrected for use with virtually all fullframe SLR lenses regardless of exit pupil distance. Thus, the Speed Booster ULTRA performs extremely well with professional-grade f/2.8 zoom lenses such as the 24-70mm f/2.8 and 70-200mm f/2.8 zooms by Canon and Nikon to produce 17-50mm f/2.0 and 50-142mm f/2.0 high-speed zooms, respectively. Similarly, high-speed fixed focal length lenses such as a 50mm f/1.2 will be transformed into a 35.5mm f/0.9 lens with excellent contrast and resolution from the center all the way to the edges of the image.

MB_SPEF-E-BM2 Features:

  • Increase maximum aperture by 1 stop.
  • Increase MTF.
  • Makes lens 0.71x wider.
  • Advanced 5-element/4-group optical design incorporating ultra-high index tanatalum-based optical glass by Caldwell Photographic in the USA (patent pending).
  • Electronic integration of aperture diaphragm, controlled by or from the camera body.
  • Partial autofocus support for late-model (post-2006) Canon-brand lenses.
  • Powered by camera body. No external power source required.
  • High performance 32-bit processor and efficient switched-mode power supply.
  • The tripod foot is detachable and compatible with Arca Swiss, Markins, Photo Clam ball heads.
  • Disclaimer: Metabones is not licensed, approved or endorsed by Sony or Canon.


    Supported Not supported

    EF lenses

    Image stabilization (IS) lenses

    Electronic manual focusing (e.g. EF 85/1.2L II and discontinued EF 50/1.0L)

    EXIF (focal length, aperture, zoom range)

    P, A, S, M exposure modes

    Autofocus (see autofocus support section below)

    Distance and zoom display on VG and FS series camcorders (see note 1)

    Auto magnify (see note 1)

    Contax N mount lenses modified to Canon EF by Conurus (see note 2)

    Contax 645 NAM-1 adapter modified to Canon EF by Conurus (see note 2)

    Sigma, Tamron and Tokina lenses in Canon EF mount (see note 3)

    EF-S lenses

    DX lenses

    NEX-VG900 (see note 4)

    Lens correction such as peripheral shading, CA and distortion

    Focus confirmation "chip" (e.g. Dandelion)

    M42 screw mount adapters (see note 6)

    Stacking non-Metabones/non-Conurus mount adapters on top (see note 7 and list of lenses which require modification below.)

    Certain telephoto lenses (see note 8)