Used Celestron Dew Heater Ring, 6" Mount then polished flat on both

then polished flat on both sides to a quarter wavelength to ensure maximum image sharpness and distortion over the entire filter

: Hercules cluster M13

AR coatings

Radiant Aluminum Quartz (RAQ)™ mirror coatings

Used Celestron Dew Heater Ring, 6" Mount then polished flat on bothPRICE DROP! WAS $30; NOW JUST $20! Condition: This is a used Celestron 6" dew heater ring in excellent condition. It includes all accessories and looks like it was hardly, if ever taken out of the box used. Note: A separate dew heater controller and power source are required to utilize the heater ring. Heater ring provides the most efficient heating directly to the corrector lens to prevent the formation of dew Permanently mounts to your existing