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.

Key Features
Leica R-mount lens to L-mount cameras/camcorders ;
This product is designed for the APS-C Crop mode of the specific cameras (eg. 4K 60P Crop mode of Panasonic S1H, S5 and S5K, etc).
Increase maximum aperture by 1 stop;
Increase MTF;
Makes lens 0.71x wider;
The advanced 5-element/4-group optical design incorporating ultra-high index tantalum-based optical glass by Caldwell Photographic in the USA (patent granted);
Satin Surface Finish;
Aluminum Alloy and Brass Construction with Chromium Plating;
Detachable Arca-Type tripod foot compatible with Arca Swiss, Markins, and Photo Clam ball heads(clamp directly or attach to quick release plate by a 1/4"-20 screw);

Camera Mount: L-Mount
Lens Mount: Leica R
Magnification : 0.71x
Weight: 0,37 Kg