Sky Watcher Esprit 150ED Reducer/Flattener .77x

Sky Watcher Esprit 150ED Reducer/Flattener .77x. This flattener lens module can be installed between the telescope optical elements and the camera objective lens. When installed the 150ED transforms the optical elements of the Sky Watcher 150 ED Telescope into a 2" filter cell converting the focal ratio from f/7 to f/5.4. This feature alone will not only reduce the exposure time but will also yield a brighter and more stable image. The Sky-Watcher 150 ED Flattener module has been designed to wor