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Due to the combination of the narrow bandwidth of 12nm and the high transmission of typically 96% the filter gives you an contrast boost, as all unwanted light from other wavelengths than 656nm is blocked form UV up to the IR. This results in an very dark background compared with any filters with a higher bandwidth. The FWHM of 12nm is optimized for typical DSLR cameras with CMOS sensors and CCD cameras with a normal/high dark current: With these cameras the background signal in images taken from heavily light polluted sites is dominated by the dark current of the sensor, not by fluy coming from light pollution. In this case a further reduction of FWHM does not improve the image, as the background will not get darker. Compared to the 6nm filters you have more stars in the field of view which gives you more guiding stars when working with an integrated/dual guiding chip!
The filter blocks all unwanted light from artifical light-pollution, natural airglow and moonlight. Especially light from High- and Low-Pressure Sodium and mercury lights and all lines of natural airglow are 100% blocked. The filter increases the contrast between the sky-background and objects glowing at the H-alpha line at 656nm.
Guaranteed Transmission of more than 90% at the H-alpha Line (656 nm)
Typical Transmission of 96% at the H-alpha Line (656 nm)
Full-Width-Half Maximum (FWHM): 12nm
perfect blocking of unwanted light from UV up to the IR
parfokal with all Astronomik filters
MFR Coating technique: Usable with all optics up to f/3
Thickness of 1mm
Not sensitive to moisture, scratch resistant, not aging
opticaly polished substrate, striae-free and free of residual stresses
High quality storage box