Celestron Polarizing Filter Set (1.25")

Ambient daylight is normally comprised of multiple wavelengths of light, vibrating in multiple planes. The Eyepiece Polarizing Filter Set transmits only light moving along a specific plane, thereby increasing the contrast between surfaces with different planar transmissions. Generally, the polarization effect makes blue skies a deeper blue, eliminates surface reflections and helps reduce atmospheric haze.

The Polarizing Filter Set is intended for visual use. It's particularly useful for reducing glare while observing the moon, double stars, the planets and terrestrial subjects all without affecting the color of the object being observed.

The Filter Set is comprised of two filters that thread into either the eyepiece or the filter adapter, which comes with the set. When one filter is used alone, you get 30% light transmission. When both filters are used together, you can vary the degree of transmission. By causing the amount of transmitted light to vary, the filters become, in effect, a continuously variable neutral density filter. At maximum density, the Polarizing Filter Set transmits only 5% of entering light.

Both of these Polarizing filters can be unthreaded and rethreaded on any 1.25" eyepiece for Eyepiece Projection photography, which is usually a Schmidt Cassegrain application.