MBSPNFG-L-BM1 G-L

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
Nikon F-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).
Compatible with both Nikkor G lens & F lens (include non-AI & AI lens mounts)
Industry's best aperture clickless ring covers an 8-stop range marking, clearly indicating the actual number off-stops. No more guesswork. (Patent granted) ,
Parented 5-element/4-group optical design incorporating ultra-high index tantalum-based optical glass by Caldwell Photographic in the USA ,
Increase maximum aperture by 1 stop,
Increase MTF,
Makes lens 0.71x wider,
Rubber gasket protects the L-mount connection from dust and moisture ,
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),