Art No. : AD111 Skylight Filter
This general purpose Wratten #1A filter improves color saturation and balance, increases visual and photographic contrast, and decreases glare in lunar and planetary observing.
The filter threads on to the rear cell of Celestron or Meade Schmidt-Cassegrain telescope to serve as an effective dust seal. By leaving this filter on when attaching or removing other visual accessories, to prevent dust and other atmospheric contaminants from entering the rear of Schmidt-Cassegrain telescope.