CELESTRON SMART DEWHEATER CONTROLLER f/4 77x Flattener/Reducer for Esprit 150ED

77x Flattener/Reducer for Esprit 150ED telescopes shortens the focal ratio of the 150ED to f/5

centre-positive

The secondary mirror is oversized in order to have a fully illuminated field and to avoid any vignetting

No barlow or focusing elements included

CELESTRON SMART DEWHEATER CONTROLLER f/4 77x Flattener/Reducer for Esprit 150EDThe Celestron Smart DewHeater 2x is an advanced two channel dew heater controller that uses realtime data to provide enough heat to prevent dew forming on your optics. The Smart Control system monitors the ambient outside temperature and humidity and automatically adjusts power to the dew heaters, using just enough power to keep the optics above the dew point while maximizing battery life. Natively compatible with Celestron Dew Heater Rings as well as