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Metabones MB_SPROLLEI-X-BM2 Rollei QBM to X-mount Speed Booster ULTRA 0.71x (Black Matt)

  • £336.49
Status   |   Usually dispatched within 24 hours


  • Increase maximum aperture by 1 stop.
  • Increase MTF.
  • Makes lens 0.71x wider.
  • Optics designed by Caldwell Photographic in the USA (patent pending).
  • The tripod foot is detachable and compatible with Arca Swiss, Markins, Photo clam ball heads.

Metabones MB_SPROLLEI-X-BM2 (MB_SPROLLEI_X_BM2, MB/SPROLLEI/X/BM2, MB SPROLLEI X BM2) Rollei QBM to X-mount Speed Booster ULTRA  0.71x (Black Matt)

Speed Booster ULTRA  for Rollei QBM lenses to adapt for use with Fuji X cameras.

Sharper corners, less distortion, reduced vignetting 

New optical design: Advanced 5-element/4-group optical design incorporating ultra-high index tanatalum-based optical glass to achieve extraordinary optical performance with improved corner sharpness, distortion and reduced vignetting.

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. 

  • Magnification Factor: 0.71x
  • Max Aperture Increase: 1 stop
  • Camera Fitting: Fuji X
  • Lens Fitting: Rollei QBM Mount


In the box

  • Speed Booster ULTRA
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