The Nikon F Lens to Sony E-Mount Camera Lens Turbo Adapter Mark II from Mitakon allows full frame Nikon F lenses to be mounted on 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. It uses four optical elements to project light from the lens onto the camera's APS-C sensor, allowing the sensor to capture all of the lens' transmitted light. This eliminates the 1.5x crop factor and effectively produces full-frame coverage on a non-full-frame sensor. A corresponding increase in the maximum aperture of 1 f-stop also makes the lens more effective in low-light situations.

One extra-low dispersion (ED) lens element reduces aberrations, and an optimised lens coating reduces flare and ghosting for improved over-all image quality. A sturdy metal construction and stainless steel mount allow it to attach securely.

The Lens Turbo is a manual adapter offering no electronic communication between lens and camera. Although it will physically fit Sony full frame mirrorless cameras it is designed for use with APS-C sensors, so on Sony full frame mirrorless cameras, the camera must be set to Crop Mode to fully support the speed booster's functions.