Celestron UHC Light Pollution Reduction Filter

No filter can completely erase light pollution. This UHC filter is designed to selectively block specific wavelengths emitted by mercury and sodium vapor streetlights, which darkens the background sky and helps emission nebulae stand out, but it won't turn a bright city sky into a pristine dark site.

This filter is designed for 2-inch (50.8 mm) eyepieces. It features a standard threaded mount, so as long as your eyepiece or diagonal is threaded for 2-inch filters, it should screw in easily.

This filter is specifically optimized for emission nebulae. Because it blocks certain wavelengths of light, it is generally not recommended for viewing planets, stars, or galaxies, as it may dim the image or distort natural colors.

Very little. This filter features high-transmission coatings that allow over 97% of light to pass through the bandpass, ensuring your view remains as bright as possible while still providing the necessary contrast boost.

While primarily designed for visual observation, this filter can be used for astrophotography to help reduce sky glow in images of emission nebulae. However, keep in mind that it is optimized for the human eye's response, so results may vary compared to dedicated narrowband imaging filters.