The Sony E-Mount Camera Lens Turbo Adapter (ver II) from Mitakon allows lenses to be mounted to Sony E-Mount APS-C format cameras increasing the angle of view by 0.726x and the maximum aperture of the lens by 1 f-stop. The four optical elements of the Lens Turbo adapter condense light from full frame lens and project it onto the camera s APS-C sensor allowing the sensor to capture all of the lens transmitted light negating the 1.5x crop factor and effectively producing full-frame coverage on non-full-frame sensors. A corresponding increase in the maximum aperture of 1 f-stop makes the lens more effective in low-light situations. The Lens Turbo features an improved design to produce sharper images. Its rectangular rear lens rests closer to the camera s sensor improving light transmission and an enhanced lens coating minimizes ghosting and flare. One extra-low dispersion (ED) lens element reduces aberrations for better delineated images. The adapter offers a sturdy metal construction and stainless steel mounts it attaches to both camera and lens with little play and includes a front and rear protective cap. The Lens Turbo is a manual adapter offering no electronic communication between lens and camera. The Lens Turbo adapters are compatible with APS-C sized sensors. Although they will physically fit the Sony full frame mirrorless cameras the camera must be set to Crop Mode to fully support the speed booster s functions.