The Metabones Speed Booster ULTRA Adaptor - Canon EF to Sony NEX Mount 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. (More information can be found in the press release here)
|Lens Mount||Canon EF|
|Crop Factor||With APS-C format camera: 1.07x|
|Maximum Aperture||f/0.90 (with f/1.2 lens attached)|
|Rectilinear Distortion||< 1%|
|Lens Construction||5 Elements/4 Groups|
|Length Reduction||0.17" (4.2 mm)|
|Tripod Mount||Removable with Arca Swiss compatibility|
|Dimensions||1.0 x 3.0 x 2.8" (27 x 76 x 72 mm)|
|Weight||6.8 oz (193 g)|