The 2 "CrystalView Moon filter combines a neutral density filter with the properties of a SkyGlow filter that subtly reduces the Moon's luminosity, helps in the observations of Venus, Jupiter and Mars, and slightly reduces the effect of light pollution.
(measurements on the Varian Cary 100 spectrophotometer, July 2015)
The connection of virtually ALL astronomical filters with the exception of solar film filters (which are filters for the lens) is accomplished by screwing the filter into the frame of the eyepiece from the opposite side than applying the eye (ie from the side that we insert in the eyepiece extractor) ). The filters can be additionally connected with each other, because they have threads on both sides of the luminaire.
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