The Antlia H-Alpha, OIII, SII Pro 3 nm Narrow Band Filter Kit is a premium solution specifically designed for monochrome CMOS astro camera owners. The narrow-band filter set is extremely narrow, with a 3 nm passband, which is also useful under light-polluted urban skies, and cuts off the other wavelength ranges.
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-alpha, OIII, SII 3 nm narrowband filter set guarantees more than 88% transmission in the central 1 nm range (OIII: 500.7 nm, H-alpha: 656.3 nm SII: 671.6 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 anti-reflective and anti-scratch coatings