The ALPA lens for SONY E-mount Speed Booster ULTRA camera from Metabones improves on the original Metabones Speed Booster with a 5/4 optical design group element that incorporates ultra high tantalum-based glass.
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ContactThe ALPA lens for SONY E-mount Speed Booster ULTRA camera from Metabones improves on the original Metabones Speed Booster with a 5/4 optical design group element that incorporates ultra-high tantalum-refractive index based glass to improve sharpness and reduce distortion and vignetting. The Speed Booster ULTRA allows a full-screen ALPA lens to be mounted on an APS-C E-Mount format camera and in doing so, increases the viewing angle and increases the maximum aperture by about one f/stop.
When a lens intended for full 35mm frame or film sensors is mounted on a camera with an APS-C size sensor, it transmits a larger area of light than the smaller sensor was built to accept and therefore the effective angle of view of the lens increases. The Speed Booster condenses the light from the lens and projects it onto the APS-C sensor which allows the sensor to use the entire lens' light and effectively reduces the crop factor of APS-C and E-Mount camera from 1.5x to 1.07x, producing a full frame angle of view with an APS-C sensor. A corresponding increase in the maximum aperture of one f/stop makes the lens more effective in low-light situations and capable of creating a depth of field.
Speed Metabone Boosters are quality made using precision machined brass with chrome plating on both the camera body and the lens side of the booster dose in order to ensure smooth mounting, aesthetic quality, and durability. This adapter has a detachable tripod foot that is compatible with the Swiss Ark, Markins and Photo Clam ball joints.
Although the lens fits physically, the automatic diaphragm (AE Measurement), or other auto functions are not preserved the use of this speed booster. These speed boosters are only fully compatible with mirrorless APS-C housing cameras or smaller image sensors. They physically fit the SONY full-frame mirrorless cameras, but the camera must be set to crop mode to fully support the functions of speed booster.
The ALPA lens for SONY E-mount Speed Booster ULTRA camera from Metabones improves on the original Metabones Speed Booster with a 5/4 optical design group element that incorporates ultra high tantalum-based glass.