Metabones Speed Booster ULTRA FUJI X to Alpa

The ALPA lens for Fujifilm X-Mount Camera Speed Booster ULTRA from Metabones improves upon the original Metabones Speed Booster with a 5 element/4 group optical design that incorporates ultra-high refractive index tantalum-based glass for improved sharpness and reduced distortion and vignetting. The ULTRA Speed Booster enables an ALPA full-frame lens to be mounted on an APS-C format X-Mount camera and, in doing so, increases the angle of view and increases the maximum aperture by approximately one f/stop.
When a lens intended for full frame or 35mm film sensors is mounted on a camera with an APS-C sized sensor, it transmits a larger area of light than the smaller sensor was built to accept and thus the effective angle of view of the lens increases . The Speed Booster condensed light from the lens and projects it onto the APS-C sensor which allows the sensor to utilize the full lens light and effectively reduces the crop factor of the camera and APS-C E-mount from 1.5x to 1.07x, producing a full-frame angle of view with an APS-C sensor. A corresponding increase in maximum aperture of one f/stop makes the lens more effective in low-light situations and capable of creating depth of field.
Although the lens physically fits, automatic aperture (AE metering), or other auto functions are not retained using this speed booster. Metabones speed boosters are quality made, using precision machined brass with chrome plating on both the camera body and the lens side of the booster in order to ensure trouble-free mounting, aesthetic quality and durability. A matte black interior reduces internal reflections and a satin black external surface finish matches most camera bodies and lenses. This adapter has a detachable tripod foot that is compatible with the Arca Swiss, Markins, and Photo Clam ball heads. It allows an ALPA full-frame lens to be mounted on a Fujifilm X-mount APS-C format camera and, in doing so, increases the angle of view and increases the maximum aperture by one f/stop. The Ultra Speed Booster design incorporates ultra-high index tantalum-based optical glass for improved optical performance with enhanced corner sharpness and reduced distortion and vignetting. This glass technology and optical design perform very well with f/2.8 professional-quality zoom lenses and high-speed fixed focal length lenses, such as a 50mm f/1.2 that will perform like a 35.5mm f/0.9 lens with high contrast and resolution from the center to the edges of the image. precise fit and solid connection - lens has no play, gap or wiggle when mounted on speed booster and no adjustments are required to fit your lens. Both the camera side and the lens side of the Speed Booster are made of brass, which is precision machined and chrome plated. The Speed Booster uses matte black treatment to keep internal reflection to a minimum in order to maintain the highest possible optical quality with the lens. The exterior features a black satin surface finish. Designed to reach infinity focus while maintaining the correct inscription distance required to maintain the optical quality of CRC lenses or lenses with floating elements. The Speed Booster features a detachable tripod foot that is compatible with the Arca Swiss, Markins, Photo Clam ball heads. Although the lens physically fits, automatic aperture (AE metering), or other auto functions are not retained using this speed booster.