Metabones ULTRA Speedboosters Increase Angle of View and Maximum Aperture
Metabones Speed Boosters sent a shockwave through the mirrorless photography world when they were first introduced last year, and the currently available, second-generation Speed Boosters have been improved significantly since their initial offering. Speed Booster ULTRA models are presently made for Sony E-mount and Fujifilm X-mount mirrorless cameras and offer connections for numerous lens types, including Canon EF, Nikon F, Sony A and Leica R mounts.
Speed Boosters perform a particularly impressive feat when they connect a full-frame lens to a mirrorless camera. They increase the angle of view of the lens by 0.71x and increase its maximum aperture by 1 f/stop. Not only do Speed Boosters enable attaching a variety of third-party lenses to your camera, but by condensing the light passing through the lens onto the smaller mirrorless format sensor, they effectively enable full-frame shooting with E-mount and X-mount APS-C cameras and the accompanying low light.
The second-generation ULTRA Speed Boosters utilize ultra-high-index tantalum-based optical glass for enhanced performance with improved corner sharpness and reduced distortion and vignetting. While each model has mount-specific features, they all provide chromium plating on both camera and lens sides, smooth play-free attachment, black matte interiors and a detachable tripod foot. From the Canon EF-mount lens to Sony E-mount cameras, Speed Booster ULTRA also provides electronic control of aperture and autofocus.