The Antlia EDGE H-alpha, OIII, SII Pro 4.5 nm narrowband filter set is a premium solution for owners of monochrome CMOS astrophotography cameras. This narrowband filter set performs well even under light-polluted urban skies and features an extremely narrow 4.5 nm passband, blocking all other wavelength ranges.
Antlia narrowband deep-sky filters deliver exceptional contrast, allowing astrophotographers to achieve excellent results even under light-polluted urban skies or in the presence of moonlight. The Antlia EDGE H-alpha, OIII, SII 4.5 nm narrowband filter set guarantees over 90% transmission in the central 1 nm ranges (OIII: 500.7 nm, H-alpha: 656.3 nm, SII: 671.6 nm), making it perfectly suited for astrophotography with very fast lenses and telescopes. Even at an extreme f/3 focal ratio, transmission loss is minimal.
Compared to the Antlia 3 nm passband version, it allows for shorter exposure times and is also more affordable. In the OIII range, the 3 nm version provides higher contrast, while its narrower passband makes it more suitable for imaging from locations with higher levels of light pollution.
In summary, the advantages of Antlia narrowband filters are as follows:
- High transmission and minimal bandwidth maximize contrast
- The steep transmission curve minimizes halos around bright stars
- Suitable for use in both light-polluted and dark locations
- Allows for longer exposure times even in strong moonlight
- Low transmission loss even when used with f/3 telescopes and lenses
- The matte black coating on the filter glass edges prevents internal reflections from stray light
- Excellent optical quality reduces the need for image post-processing
- The filters are made from high-quality Schott glass.
- They feature at least lambda/4 or better surface accuracy, placing them in the premium category.
- The optical surfaces are treated with anti-reflection and scratch-resistant coatings