Metabones MB_SPLR-EFR-BM1 Leica R Lens to RF-Mount Speed Booster ULTRA 0.71x

Metabones MB_SPLR-EFR-BM1 (MB-SPLR-EFR-BM1, MB/SPLR-EFR-BM1, MB/SPLR/EFR/BM1, MBSPLREFRBM1) Leica R Lens to RF-Mount Speed Booster ULTRA 0.71x 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 full-frame 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. Limitations The product is designed for the APS-C format camera (eg. Canon C70 and RED Komodo, etc.) or using with the APS-Crop mode of EOS R3, R5, R6, EOS R and EOS RP; The rear element of the lens cannot protrude from the flange more than 10.5mm. The following lenses require modification in order to fit on the Speed Booster. Super-Elmar-R 15mm Elmarit R 28/2.8 Elmarit R 35/2.8 Summicron R 50/2 Super telephotos such as the Telyt 560/5.6 may vignette at the corners. This adapter is a mechanical adapter. It does NOT support electronic aperture control, AF, and EXIF.