The H&Y StarKeeper Filter is made up of glass constructed by the oxidization of the chemical Neodymium, creating a purple/blue effect that absorbs yellow sodium-vapor, mercury-vapor and yellow light from low CRI LED’s. By absorbing this unwanted light, contrast will be increased and stars will appear more visible and defined – giving you that “pop” when shooting into clear skies at night.

Features
9-Layer Multi-Coating,
Optical Glass
Neodymium glass night time filter for Astrophotography
– to makes the stars pop