Altair ColourPRO TRI-RGB Light Pollution Filter 2 Inch

Product Description

Keep your colour balance as close to real-world as possible, whilst addressing as much light pollution as possible, with no sacrifice in OD blocking, nor in transmission!

The new version of the famous Altair TRI-RGB comes with individual test certificate showing the wavelength transmission spectra, slightly improved transmission performance, better anti reflection coatings, deeper OD blocking of unwanted wavelengths, and blackened edge coatings for maximum contrast / stray reflection control.

Altair TRI-RGB is great for broadband objects such as mixed emission / reflection nebulae, comets, dust clouds and galaxies, but it also allows the major emission nebulae lines through. It covers both broadband AND narrowband targets.
TRI-RGB complements the Altair TriBand and DualBand filters by adding star colours.
TRI-RGB and works with fast or slow focal ratio telescopes and camera lenses.
TRI-RGB is not only for light pollution control. It works very well under dark skies too by enhancing colour purity, airglow and reducing channel crossover in colour CMOS and DSLR cameras.
Although primarily intended for colour cameras, TRI-RGB can be used for a cleaner luminance channel with a mono camera.
High transmission peaks with steep sides enhance contrast, together with almost total suppression of unwanted light, at OD4.5/5 (0.01%~0.001%) over the majority of unwanted visual wavelengths.

Solar system and deep-sky: ColourPRO TRI-RGB boosts contrast when used visually on both deep-sky objects and planets. In particular, Saturn, Jupiter and Mars. The Altair TRI-RGB Ultra filter transmits Hydrogen, Oxygen, Sulphur, and Nitrogen light bands from emission nebulae extremely well. The high transmission enables this filter to be used on any size telescope.

OD4.5/5 Blocking (0.01%~0.001%) over the majority of unwanted visual wavelengths
1.85mm thick optical glass with 30 arc sec parallelism. (Parfocal with Altair filters).
Si02 "hard" overcoat for durability.
UVIR Blocker
Anti-Reflection Coating to minimise halos and reflections
Black coated edges to minimise reflections and improve contrast.