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This is a used 1.25-inch Lumicon H-Beta filter, noted as being "The Horsehead Nebula Filter." This filter only transmits light on a single wavelength, Hydrogen-Beta, and effectively blocks all other wavelengths. The Lumicon case certifies the transmission level solely in the H-Beta wavelength of 94%.
The filter comes in its original case and is in very good shape, showing some minor dust due to its age and use. This condition has been reflected in the bargain price you see.
Lumicon 1.25" H-Beta Filter
Also known as the Horsehead Nebula filter, the Lumicon 1.25" Hydrogen-Beta Filter isolates only the hydrogen-beta line of the spectrum (486 nm) in a narrow pass-band just 9 nm wide, providing maximum contrast. Now you can view extremely faint nebulous objects such as the Horsehead, Cocoon, and California Nebulae. In many cases, the Lumicon Hydrogen-Beta Filter is the ONLY way to view these objects. Recommended for 12" or larger telescopes. To ensure that your Lumicon filter remains the World's Best, the strictest quality control standards are employed throughout the production process.
Each Lumicon Hydrogen - Beta Filter is individually inspected and proudly inscribed with the percentage of light transmittance of the H-Beta emission line.To ensure that your Lumicon filter remains the World's Best, the strictest quality control standards are employed throughout the production process. Each Lumicon Deep Sky Filter is individually inspected and proudly inscribed with the percentage of light transmittance of the H-Alpha, H-Beta and OIII emission lines.
- Extremely narrow bandpass filter isolating the hydrogen-beta line alone (486 nm)
- Excellent for viewing the Horsehead, Cocoon, and California Nebulae
- Often the only way to view certain nebulae
- It is best used under clear skies with large aperture