The Lumicon Deep Sky Filter is Lumicon''s most popular nebula filter. It blocks all high and low pressure mercury and sodium vapor lamp light, neon lights and airglow, while transmitting the rest of the visible spectrum. Visually, the Deep Sky Filter enhances contrast of nebula under both light-polluted and dark skies. The Deep Sky Filter also passes infrared light, making it an excellent filter for photographing deep space objects through light-polluted skies.

To ensure that your Lumicon Deep Sky 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.

The Lumicon Deep Sky Filter rejects man-made and natural light pollution. Mercury light pollution occurs at 365, 405, 436, 546, 577, and 617nm. High-pressure sodium streetlights emit at 570, 583, 600, and 617nm. Natural airglow occurs at 558 and more weakly at 630nm. There is a window of greatly reduced light pollution from 440nm (blue) to 540nm (green). The Lumicon Deep Sky Filter has a wide 90-100nm bandpass for most of this range (441-535nm) to yield maximum transmission of light from stars and galaxies. The UHC Filter has a narrow 22nm bandpass through 484-506nm. The OIII Filter has a very narrow 11nm bandpass for 495-501nm, and the H-beta Filter has the narrowest bandpass of all - only 8nm centered at 486nm. The narrower the bandpass, the higher the rejection of light pollution and the blacker the skies. However, a narrower bandpass also means fainter star images. Nevertheless, the Deep Sky Filter has high transmission for the photographic red nebula emission lines.

• Utilizes very hard electron-beam deposited coatings on one side of the glass substrate, and delicate anti-reflection coatings on the other

   

   

• Individually inspected and proudly inscribed with the percentage of light transmittance of the H-Alpha, H-Beta and OIII emission lines

   

   

• Blocks all high and low pressure mercury and sodium vapor lamp light, neon lights and airglow, while transmitting the rest of the visible spectrum

   

   

• Passes infrared light, making it an excellent filter for photographing deep space objects through light-polluted skies

Filter Type: Deep Sky

Filter Size: 1.25"

Presentation: Round, threaded cell

Bandpass: 9mm

Optimum Exit Pupil (Light Polluted Skies: 0.5-2mm

Optimum Exit Pupil (Dark Skies): 1-4mm

Glass Type: Hoya or Schott