The Antlia EDGE H-alpha, OIII, SII Pro 4.5 nm narrowband filter set is a premium solution for owners of monochrome CMOS astro cameras. This narrowband filter set performs exceptionally well even under light-polluted urban skies, featuring an extremely narrow 4.5 nm passband while blocking all other wavelengths.
Antlia narrowband deep-sky filters deliver exceptional contrast, enabling 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 within the central 1 nm ranges (OIII: 500.7 nm, H-alpha: 656.3 nm, SII: 671.6 nm), making it perfectly suited for astrophotographic use with very fast lenses and telescopes. Even at an extreme f/3 focal ratio, transmission loss remains minimal.
Compared with the Antlia 3 nm passband version, shorter exposure times can be achieved, and it is also more affordable. In the OIII range, the 3 nm version provides higher contrast, and its narrower passband makes it better suited for imaging in locations with higher levels of light pollution.
In summary, the advantages of Antlia narrowband filters are as follows:
- High transmission and minimal bandwidth maximise contrast
- The steep transmission curve minimises halos around bright stars
- Suitable for use in both light-polluted and dark locations
- Allows 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 of 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-reflective and scratch-resistant coatings