Optical Filters

Telescope filters are simple accessories that can dramatically improve what you see. Explore Scientific's optical filters are designed to improve contrast, reduce glare and bring out subtle details, making them essential tools for both visual astronomers and astrophotographers. This collection brings together nebula filters, light pollution filters, neutral density and polarizing Moon filters and more.

Nebula and narrowband filters, including CLS, UHC, O-III, H-Beta, H-Alpha and S-II, isolate the light from glowing gas clouds and suppress skyglow, revealing faint nebulae from suburban skies. Neutral density and variable polarizing filters reduce the overwhelming brightness of the Moon for comfortable, detailed lunar observing. Light pollution filters such as the Optolong L-Pro, L-eNhance and L-eXtreme are popular for deep-sky astrophotography from light-polluted locations. Available in 1.25-inch and 2-inch sizes, these filters thread onto most eyepieces, diagonals and camera adapters.

Choosing a filter starts with your target and your sky. Suburban observers benefit most from light pollution and nebula filters, lunar observers from Moon filters, and astrophotographers from narrowband filters that isolate specific emission lines. Make sure the filter size matches your eyepiece or diagonal thread, and remember that filters reduce overall brightness, so they work best with telescopes that gather plenty of light. With the right filter, you can see and photograph objects that would otherwise be hidden by skyglow or glare.