A high quality eyepiece filter for reducing the brightness of the moon and improving contrast and surface detail.
Bright, light-polluted skies appear much darker, and the contrast between object and sky is improved significantly.
Contrast-enhancement effect is particularly apparent on nebulas.
Views of galaxies and star clusters are also enhanced in certain circumstances.
Description
Crystalview Moon Filter. It is the best you can get for lunar viewing and it fits 2" telescope. They are useful for splitting binary systems, comfortably observing the moon, or stacking with other planetary filters.