Lunar neutral density moon filter, 2 "ND 0.3, transmits 50 percent light from the falling beam.
It improves the contrast when observing our natural satellite, especially in the near full phase, it will be useful when observing Venus and Jupiter.
Connection of 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 put 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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