Sky-Watcher 0.77x Reducer/Flattener for EvoStar 150DX f/8 Refractor

This 0.77x Reducer/Flattener is designed for the Evostar 150DX APO refractor. It decreases the f/ratio from the optical tube's native f/8 to f/6.2 and reduces exposure time by 66% compared to native f/8 with the same results. Features 34mm fully illuminated field, 89mm back-focus or 55mm using the included back focus spacer and M48 ring. Compatible with both APS-C and full frame sensors.