Askar 7nm Ha Narrowband Filter

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About this product

The Askar H-alpha (Ha) 7nm filter is designed for the imaging of H-alpha emitting nebulae or some supernova remnants and the the large emission nebulae in some spiral galaxies.

The Askar H-alpha filter has very high transmission at a centre wavelength of 656.3nm. The 7nm narrow bandwidth enables this nebula-imaging filter to block all light pollution and other unwanted artificial lights or night glow. Hence the Askar H-alpha filter is suitable for astro-imaging in heavily light-polluted locations and delivers enhanced contrast at darker locations.

Peak transmission is 90%.

The Askar H-alpha filter works well on those nebulae emitting ionised hydrogen or the H II regions in nearby galaxies, this Askar H-alpha filter can bring out intricate details of nebulae and supernova remnants. Also, the out-of-band blocking ability is rated at OD4 (0.01%) with the blocking range of 200-1050nm. It delivers an excellent signal-to-noise ratio and a sharp cut-off rate to attenuate the disturbance from other wavelengths.

The production process is strictly controlled and every single Askar H-alpha narrowband filter is individually examined and tested.

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