Improve the visibility of deep sky objects by blocking mercury vapour, sodium vapour and other such emission lines from artificial or natural sources that contribute to light pollution
Improves contrast in reddish planetary details Works well in telescopes of all openings
The filter fits all standard 1.25″ eyepieces and accessories. Can be threaded on both sides to stack with other filters if required
Comes with a sturdy plastic housing to protect the eyepiece from dust and moisture