Like the revolutionary original Metabones Speed Booster announced in January 2013, the Metabones Minolta MD to X-mount Speed Booster ULTRA 0.71 (Black Matt) MB_SPMD-X-BM3 has a magnification of 0.71x, and so it effectively reduces the crop factor of mirrorless cameras with crop-sized sensors, such as 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 full-frame SLR lenses regardless of exit pupil distance.
The Speed Booster ULTRA performs extremely well with professional-grade f/2.8 zoom lenses. 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.
New optical design: advanced 5-element/4-group optical design incorporating ultra-high index tantalum-based optical glass to achieve extraordinary optical performance with improved corner sharpness, distortion and reduced vignetting.
The some/following Minolta lenses are incompatible unless the lens aperture levers are modified. The lens aperture levers are not able to protrude more than 10.5mm from the surface of the lens flange when used in conjunction with Speed Booster.
|Lens Mount||Minolta MD|
|Crop Factor||With APS-C format camera: 1.07x|
|Maximum Aperture||f/0.90 (with f/1.2 lens attached)|
|Rectilinear Distortion||< 1%|
|Optical Construction||5 Elements/4 Groups|
|Tripod Mount||Removable with Arca Swiss compatibility|
|Length Reduction||0.17" / 4.32mm|
|Weight||6.8oz / 192.78g|