The Antlia H-alpha, OIII, SII Pro 3 nm Narrowband Filter Set is a premium solution specifically designed for monochrome CMOS astro camera owners. This narrowband filter set, which is highly effective even under light-polluted urban skies, features an extremely narrow 3 nm transmission, blocking out other wavelength ranges.
The Antlia narrowband deep-sky filters offer exceptional contrast, allowing astrophotographers to achieve excellent results even under light-polluted urban skies or in the presence of moonlight. The Antlia H-alpha, OIII, SII 3 nm narrowband filter set guarantees over 88% 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 at an extreme f/3 focal ratio, there is only minimal transmission loss.
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
- Can be used 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 filter edges prevents internal reflection 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 as premium category
- The optical surfaces are coated with anti-reflection and scratch-resistant coatings by the manufacturer