The Antlia H-Alpha Pro 3 nm Narrowband Filter is a premium solution specifically designed for monochrome CMOS astro camera owners. The narrow-band filter, which can be used well under light-polluted city skies, has an extremely narrow 3 nm passband, cutting off the rest of the wavelength range.
The Antlia narrow-band low-pass filters offer exceptional contrast, allowing the astrophotographer to achieve very good results even under light-polluted city skies or under the influence of moonlight. The Antlia H-Alfa Pro 3 nm narrowband filter guarantees more than 88% transmission in the central 1 nm range (656.3 nm), making it perfect for photographic use with very bright lenses and telescopes. Even at extreme f/3 focal ratios, there is only minimal transmission loss.
In summary, the advantages of Antlia narrowband filters are:
- High light transmission and minimum bandwidth to maximise contrast
- A steeply sloping transmission curve minimizes halos around bright stars
- Can be used in both light-polluted and dark locations
- Longer exposure times even in strong moonlight
- Low transmission loss even when using F/3 aperture binoculars and lenses
- The glass edges of the filters are painted matte black to prevent internal reflection of stray light
- High optical quality reduces the need for image post-processing
- The filter is based on high quality Schott glass .
- They have a lambda/4 or better surface accuracy, i.e. premium category.
- Optical surfaces are coated with reflection threading and anti-scratch coatings