♦ 2" low profile filter mount with M48x0.75 thread
♦ Suitable for telescopes and lenses with a focal ratio of f/3 and slower
♦ Optical Schott base substrate
♦ Blackened edges to avoid internal reflections
♦ Extremely narrow bandwidth of only 5 nm for maximum contrast
♦ Precise transmission in H-alpha and in O-III
♦ Filter thickness 2 mm
♦ Supplied in convenient plastic transport box
♦ High light transmission and smallest bandwidth to maximize contrast.
♦ Steep spectral profile minimizes halos around bright stars
♦ Single substrate to eliminate internal reflections
♦ Usable in light-polluted areas and dark locations
♦ Extends exposure time in moonlight conditions
♦ Antlia narrowband Pro filters can be used with low signal loss down to F/3 systems
♦ All Antlia narrowband filters are blackened at the edges to prevent internal reflections of stray light
♦ Superior optical reliability reduces image post-processing effort
Substrate: | Schott optical substrate |
Filter thickness: | 2 mm |
Cell: | Low-profile metal cell with M48x0.75 filter thread |
FWHM: | 5 nm |
CWL: | 656.3 nm (90%), 500.7 nm (82%) |
Surface quality: | S/D (scratch/dig)= 60/40 (Refer to MIL-O-13830) |
Surface accuracy: | Lambda/4 or better |