Filter for Black & White Deep Sky Photography
Lumicon's Night Sky Hydrogen-Alpha Filters are long-pass filters with a 50% transition from blocking to passing at about 640nm. At wavelengths longer than 650nm, transmittance is 90% or above. The filter is used as an extreme anti light-pollution filter, and for contrast-enhancement of emission nebulae and other astronomical objects bright in the infrared.
WARNING: DO NOT LOOK AT THE SUN THROUGH THE LUMICON Night-Sky H-ALPHA FILTER. Eye Damage could result from solar heat transmitted through this filter. The Lumicon Night-Sky Hydrogen Alpha Filter, is designed to be used for Black and White Deep-Sky Photography (Not for solar or visual work). Transmission for this sharp-cut-off deep-sky photography filter is zero below 630 nm, 90% at Hydrogen-Alpha 657 nm, and 90-98% from 657 nm to the near infrared. Both filter surfaces have high-efficiency anti-reflection coatings for maximum performance. This Lumicon filter is designed to be attached to the rear cell of a Cassegrain telescope.
For Deep-Sky Photography: The Lumicon Night-Sky H-Alpha Filter is a powerful aid in overcoming light pollution, and will help you achieve strikingly improved results in telephoto lens B and W astrophotography. It is ideally matched to hypersensitized 2415 film, and will reduce light pollution 10-fold, making it ideal for photography of faint emission nebulae.
Filter Factor: Exposures may be increased 2-10 times with the Night-Sky H-Alpha Filter, depending on the faintness of the nebula. The Night-Sky H-Alpha Filter is not suitable for visual use. Hydrogen Alpha Pass filters are deep red filters blocking most of the spectrum with high transmission at the 656 nm hydrogen alpha line.
The LF3085, 1.25" Night Sky Hydrogen-Alpha Filter, threads into the nose-piece of industry-standard 1.25" Digital Imagers.
The LF3090, 2" Night Sky Hydrogen-Alpha Filter, threads into the nose-piece of industry-standard 2" Digital Imagers.
The LF3095, 2" Cassegrain Night Sky Hydrogen-Alpha Filter
The LF3100, Threaded for 58mm camera lenses.
The LF3105, Threaded for 72mm camera lenses.
The LF3110, Threaded for 77mm camera lenses.
The LF3115, Threaded for 82mm camera lenses.