Metabones Contax Yashica Lens to Fujifilm X-Mount Camera Speed Booster Ultra, 0.71x Magnification, Matte Black

The Metabones Contax Yashica Lens to Fujifilm X-Mount Camera Matte Black Speed Booster Ultra features an 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, 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.