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The Lumicon 2" Variable Polarizing Filter is the all-phase lunar filter for large telescopes. Transmittance is continuously variable from 5-35%.
Light rays which are reflected become polarized. Polarizing filters are used to select which light rays enter your lens. They can remove unwanted reflections from non-metallic surfaces such as water or glass and also saturate colors providing better contrast. The effect can be seen through the viewfinder and changed by rotating the filter. The filter factor varies according to how the filter is rotated and its orientation to the sun.
The 1.25" filters employ industry-standard 1.125" x 42 tpi threads (except for Questar/Brandon, which use a thread pattern unique to Questar). The 48 mm filters employ industry-standard 48 x 0.75 mm threading, which thread into 2" eyepieces. All larger filters use the given size with 0.75 mm pitch (e.g. a 72 mm Minus Violet filter has 72 x 0.75 mm threads).
Note: Fits 2" eyepieces
Lumicon Polarizing Filters are made from renowned Schott-Hoya optical glass and allow for maximum contrast of lunar detail
Individually precision ground, highly polished with maximum light transmission coatings on both sides, these filters are 100% guaranteed for life