Antlia SHO 2.5 nm Narrow Band Filter Set, 2" mounted

Antlia SHO 2.5 nm narrow band filter set, 2" mount

Nebula filters from Antlia offer extreme contrast. This enables astrophotographers to achieve very good results even with considerable stray light from cities or the moon. Antlia guarantees a very high transmission in the range of 1 nm around the nominal wavelength. This also makes the narrow band filters interesting for fast telescopes and lenses. Even with a focal ratio of f/3.5, there is only a minimal loss of transmission.

Characteristics of the filters

High transmittance (Ha/SII 95%, OIII 92%) and narrow FWHM 2.5nm +0.3/-0.1nm to maximize contrast

Flat-top spectrum minimizes the loss in transmission due to the Center Wavelength (CWL)-shift

Out of band blocking specification is designed to OD5 (0.001%) to block interference from other wavelengths and minimize halos around bright stars.

Made of quartz glass, excellent durability and thermal stability, better fracture resistance and scratch resistance, improved coating resilience to cleaning.

The Filters are resistant to scratches.

Identical filter thickness to existing standards and double-sided fine polishing, with utmost care for parfocality

The SHO 2.5nm Ultra filters are recommended for use in optics with a Focus Ratio of f/3.5 for best optical performance.

100% of production are scanned individually, all transmission and blocking (OD) data in the box are actual, measured spectra and transmission?

All Antlia filters are coated to the edge of the substrate

Filter
Filter box

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