Skywatcher 0,85x reducer/flattener for 72 ED

The Skywatcher 0,85x reducer/flattener for 72 ED reduces the focal length telescope from 420mm to 357mm (focal ratio changes from f5.8 a f4.96) and is used in astrophotography to reduce the focal length of instrument and flatten the field framed by the sensor. Reducing the focal length you increase the brightness of the telescope and you will greatly decrease the needed exposition time. It also reduces the field curvature and achieves a better stars image with sensors up to APS-C (about 24 x 16mm).

Therefore is the perfect accessory for astrophotography for faint objects (galaxies, nebulae and clusters) that require very long exposition time.