Purpose: For observing nebulae and stars, weaken light stimulation and add color to make the observation effect more gorgeous

Specification: British thread -0.96 inch/24.3MM

The filter is threaded and can be directly attached to the threaded eyepiece.

Optical glass moon filter designed to reduce the amount of light entering your eyepiece.

It can filter the light from a certain direction and increase imaging contrast.

Can also be used for daytime terrestrial use for reducing sunlight glare from lakes oceans or window glass.