UHC-S (Ultra High Contrast) nebulizer in a 1.25 "luminaire with thread on both sides of the luminaire.
Perfect for nebula observations, especially when using large telescopes (20 cm in diameter and larger). This filter passes through three nebulizer lines: a line of double ionized oxygen (496 and 501 nm) and a H-beta (486 nm) line and H-alpha (656 nm, an important line for astrophotography), simultaneously blocking scattered light and light pollution (sodium lines) and mercury). As a result, observations of the Orion nebula, nebulae like Laguna, Omega and other extended nebulae are breathtaking. In addition, the filter is an efficient Light Pollution filter.
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.