SVBONY SV132 2'' H-Beta 25nm Visual Filter (W9102B)

SVBONY SV132 2'' H-Beta 25nm Visual Filter The H-Beta filter is a narrowband filter specially designed for visual observation. It is mainly aimed at the 486nm (blue) line spectrum nebula, removes the interference of other light, and improves the contrast. During observation, in order to see sufficient dark nebula, it is necessary to ensure a large enough luminous flux with a large-aperture telescope. Small-aperture telescopes are not recommended. It is suitable for observing the Horsehead Nebula in Orion and the California Nebula. Filter with metal 2" threads fits 2" eyepieces and diagonal barrels. Elusive Dark Nebula Visualization Unlocks clear views of Horsehead, California and Cocoon Nebulae in dark skies, solving the problem of faint nebula invisibility. 486nm Blue Line Spectrum Targeting Focuses on 486nm blue line spectrum nebulae, filters out interfering light to significantly improve nebula contrast. Large-Aperture Telescope Compatibility Requires large-aperture telescopes to ensure sufficient luminous flux, ideal for deep-sky nebula observation in dark environments. Durable Metal Mount Design Sturdy metal frame with precise threading, ensuring stable installation without light leakage during observation. 2" Universal Fit Standard 2" filter threads, perfectly compatible with 2" eyepieces and threaded diagonal barrels for seamless integration. Features 2" Eyepiece Filter; with metal mount 2" filter threads For Horsehead Nebula California; and Cocoon Nebulae in Dark Skies Mainly aimed at the 486nm (blue) line spectrum nebula; filters out the interference of other light; can improve the contrast of the nebula Through the use of filters; the Horsehead Nebula can be clearly seen; filter with metal mount 2" filter threads; threaded to fit 2" eyepieces and threaded diagonal barrels To see a sufficiently dark nebula; ensure a large enough luminous flux; needs to be observed with a large-aperture telescope Technical Specifications Specification Value Brand SVBONY Model SV132 Type H-Beta Size 2-Inch Substrate B270 Substrate Thickness 1.85mm Wavelength Range 400-700nm CWL 486nm±2nm FWHM 25nm±2nm T peak 90% Blocking OD3 @300-1100nm Clear Aperture 44mm Surface Quality 60/40 Surface parallelism 1/4λ Parallelism 30″ Net Weight 13.2g / 0.47oz In the Box SVBONY H-beta 25nm Filter Sturdy Plastic Cases Manuals & Warranty Svbony 1-Year Warranty