ANTLIA SII 2.5nm ULTRA NARROWBAND FILTER 2" pier Diameter: 21mm

Diameter: 21mm

25″ mounted or 31mm unmounted filters

Low profile design with an optical thickness of only 77mm

blocking interference from other wavelengths and minimizing halos around bright stars

Both sides of the clamp are equipped with M68 x 1 male threads as well as an M60 x 0

ANTLIA SII 2.5nm ULTRA NARROWBAND FILTER 2" pier Diameter: 21mmThe Antlia Sulphur II 2. 5nm Ultra narrowband 2" filter has a FWHM (full width half maximum) of an incredible 2. 5nm +0. 3 0. 1nm and a high transmission efficiency of > 95% at the central wavelength. These filters are made from quartz glass which has an ultra low thermal expansion coefficient and outstanding thermal and mechanical properties. Utilizing Antlia's precisely controlled advanced coating process, these filters are exceptionally durable and