Astronomik H-alpha 12 nm 2" — narrowband imaging filter (MFR) The Astronomik H-alpha 12 nm filter isolates the 656 nm hydrogen-alpha line for imaging emission nebulae from light-polluted and dark sites alike. It blocks sodium and mercury-vapour lamp lines, all lines of natural airglow and most moonlight, giving deep, high-contrast images.
Manufacturer model: Astronomik H-alpha 12nm 2" (M48), MFR, 10212200 · Specifications checked against manufacturer data on 2026-11-03
Astronomik H-alpha 12 nm 2" — narrowband imaging filter (MFR)
The Astronomik H-alpha 12 nm filter isolates the 656 nm hydrogen-alpha line for imaging emission nebulae from light-polluted and dark sites alike. It blocks sodium and mercury-vapour lamp lines, all lines of natural airglow and most moonlight, giving deep, high-contrast images.
Why 12 nm
Astronomik developed its 12 nm filters for typical DSLR cameras with CMOS sensors and for CCD cameras with normal or high dark current. Compared with 6 nm versions they show more stars, which makes them the preferred choice for cameras with an integrated or dual guiding sensor.
MFR coating
This standard MFR version can be used with instruments from f/3 upwards without significant performance loss. For faster optics, Astronomik offers a separate MaxFR version (10250200), rated from f/1.7 to f/6. Every Astronomik narrowband filter is measured on a PerkinElmer spectrophotometer, and the box label shows that filter's own spectral data.
This filter must not be used for solar observation.
Astronomik H-alpha 12 nm 2" — narrowband imaging filter (MFR) The Astronomik H-alpha 12 nm filter isolates the 656 nm hydrogen-alpha line for imaging emission nebulae from light-polluted and dark sites alike. It blocks sodium and mercury-vapour lamp lines, all lines of natural airglow and most moonlight, giving deep, high-contrast images.
Manufacturer model: Astronomik H-alpha 12nm 2" (M48), MFR, 10212200 · Specifications checked against manufacturer data on 2026-11-03
