Hydrogen Beta Filters
The Lumicon 1.25in, 2" and Cassegrain Hydrogen Beta Filters isolate only the hydrogen-beta line of the spectrum (486nm) in a narrow pass-band just 9 nm wide, providing optimum contrast.
You can now observe extremely faint nebulous objects including the Horsehead, Cocoon and California Nebulae.
More often than not, the Lumicon Hydrogen-Beta Filter is the ONLY way to observe these objects, and is advised for 8" or larger telescopes.
In order that your Lumicon filter continues to be amongst the World's Best, the strictest quality control standards are employed throughout the manufacturing process.
The Cassegrain filter-cell threads onto the telescope's SCT rear-cell, and presents male SCT threads for accessory attachment and the filter cell allows you to switch eyepieces without the need to thread or unthread the filter, and is also much easier to change-out than the standard 2" filter cell with gloves on, for wintry weather observing.
Each and every Lumicon Filter is individually examined and proudly inscribed with the percentage of light transmittance of the H-Beta emission line.
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