The Lumicon H-Beta Filter isolates only the Hydrogen-beta line of the spectrum (486.5nm) while blocking, completely, the rest of the overall spectrum of light. The result is extreme contrast between the black background and the delicately attenuated H-beta light needed to view a few select, extremely faint objects such as the Horsehead, Cocoon and California Nebulae. In may cases the Lumicon H-beta Filter is the ONLY way to view those objects. A steady, transparent sky, 8" or larger aperture (in most cases) and a maximum-efficiency exit pupil (7mm), combined with the Lumicon H-beta Filter, all make an unbeatable combination for viewing those "notch in the belt" objects. Lumicon measures every filter individually on a Perkin-Elmer Double-Beam spectrophotometer, inscribing on the filter its % transmission for the primary H-beta Line. Not intended for photographic use.
A**O
Lumicon H-Beta filter 1.25"
Great piece of kit! I also have a Lumicon 1.25" OIII filter. These items complement each other very well arming the user for great high contrast views of almost every nebula there is to see. High quality glass and mechanical workmanship. Even the threads are smooth when threading onto the eyepiece - another of my filters is not so smooth and binds slightly when attached.
TrustPilot
1天前
2 个月前
