Celestron Variable Polarising Eyepiece Filter, 1.25in

Selectively reduce the brightness of celestial objects – Brightness can be reduced to just 1% or as much as 40%.  Simply rotating the filter’s lower ring – Image gets brighter or dimmer.  Does not alter the colour of the object you’re observing – Making it a great choice for Astro-imaging.  Darken the blue sky background when hunting for Venus or Jupiter in the daylight – Making the planet stand out from the background.  Threads on to any Celestron 1.25” eyepiece – Threaded on both sides so you can stack it with other filters.