Askar Colour Magic 2" H-Alpha 3nm Filter - CM-HA-3NM-2

For all astrophotography enthusiasts, filters are one of the indispensable accessories to achieve perfect deep-sky imaging. These dedicated astronomy filters for imaging deep-sky objects can effectively eliminate skyglow and other sources of light pollution to enhance contrast and allow the details of your deep-sky target to come through more clearly.  The 3nm Colour Magic narrowband filter is a professional astrophotography tool specifically designed for deep-sky imaging.

If you want to shoot some nebulae or supernova remnants with H-alpha particles, then the Askar H-alpha(Ha) 3nm filter is definitely an excellent tool to achieve that end.  The Askar H-alpha filter has a center wavelength of 656.3nm and an ultra-high transmittance of over 90%. The highly narrow 3nm bandwidth ensures this filter effectively blocks out light pollution or other distracting lights such as sky glow, making the Askar H-alpha 3nm filter suitable for using in areas with serious light pollution. Of course, this HA narrowband filter can effectively enhance the contrast of images when shooting in dark sky sites as well!

ColourMagic H-Alpha 3nm Narrowband Filter Specifications

FWHM:  3nm

CWL:  656.3nm

Peak Transmittance:  88%

Filter Optical Thickness:  1.85 mm +/- 0.05 mm

Barrier Property:  OD5 @ 200-1100nm

Surface Finish:  60/40

Filter Size:  2" threaded (50.8 mm)

Parallelism:  30"