0.71X focal reducer booster,it can increase one gear of aperture and the light through the lens, as well as reduce focal length.
It supports auto focus function, electronic aperture control, EXIF info.transmitting, and built-in IS stabilization function.
With USB port for adapter firmware upgrading.
Gold-plated contact pins for great conductivity.
Aluminum alloy made, CNC processing; with 1/4 screw hole at the bottom.”