The Antlia EDGE H-alpha, OIII, SII Pro 4.5 nm Narrowband Filter Set is a premium solution for monochrome CMOS astro camera owners. This narrowband filter set, which is highly usable even under light-polluted urban skies, features an extremely narrow 4.5 nm bandwidth that blocks out other wavelengths.
The Antlia narrowband deep-sky filters offer 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 in the central 1 nm bands (OIII: 500.7 nm, H-alpha: 656.3 nm, SII: 671.6 nm), making it perfectly suited for photographic use with very fast focal ratio lenses and telescopes. Even with an extreme f/3 focal ratio, there is only minimal transmission loss.
Compared to the Antlia 3 nm bandwidth version, shorter exposure times can be achieved, and the price is more favorable. The 3 nm version provides greater contrast in the OIII band and its narrower bandwidth makes it more suitable for photography in areas with higher light pollution.
In summary, the advantages of the Antlia narrowband filters are as follows:
- High light transmission and minimal bandwidth serve to maximize contrast
- The steep transmission curve minimizes halos around bright stars
- Usable in both light-polluted and dark locations
- Allows for longer exposure times even under strong moonlight
- Low transmission loss even when using telescopes and lenses with an f/3 focal ratio
- The matte black paint on the edges of the filter glass prevents internal reflections of stray light
- Excellent optical quality reduces the need for image post-processing
- The filter material is high-quality Schott glass
- They have at least lambda/4 or better surface accuracy, qualifying them as premium category
- The optical surfaces are equipped with anti-reflection and scratch-resistant coatings by the manufacturer