Celestron Variable Polarizer Filter - 1.25" - 94107 Erect Image Accessories They can be considered "focal

They can be considered "focal reducers" for eyepieces

Clear windows built into motor covers so pulleys and belts can be monitored

Explore 11mm 82 Degree Series Waterproof Telescope Eyepiece - 1

Explore Scientific Smart Phone Camera Adapter

Celestron Variable Polarizer Filter - 1.25" - 94107 Erect Image Accessories They can be considered "focalCelestron Variable Polarizing Filter 1. 25" A customizable way to reduce brightness and glare on the brightest celestial objects like the Moon, Venus, and bright double stars Adjust the level of light transmission from 1 40% for the best possible view Adjusts for your specific target and or current viewing conditions Simple to usejust rotate filters lower ring to adjust brightness Upper ring threads onto any Celestron 1. 25 eyepiece When you want to