For all astrophotography enthusiasts, filters are one of the indispensable accessories to achieve perfect deep-sky imaging. The dedicated astronomy filters for deep-sky imaging can effectively eliminate the influence from the background light and enhance the contract of your photographs and make the targets displayed more clearly and delicately. Askar’ s new-launched 3nm deep-sky narrowband filter set Color Magic is a professional astrophotography tool specifically designed for deep-sky imaging.

Compared with the previous Askar 5nm deep-sky filters, this filter set has a narrower bandwidth. Therefore, even if your are at an area affected by the urban light pollution, night glow and other undesired light, you can capture high-quality deep-sky pictures with the help of Askar 3nm narrowband filters. The narrower bandwidth and efficient light transmission considerably enhance the contrast of your pictures, making it easier to display the details of the stars that otherwise are fairly difficult to spot.

At the same time, the Color Magic 3nm deep-sky narrowband filter has very good halation control, providing more contribution to your astrophotography.

Askar 3nm SII Filter

Askar 3nm SII filter has an ultra-high transmittance over 90% at its center wavelength (672nm). The highly narrow 3nm bandwidth ensures this filter for astrophotography effectively blocks out light pollution or other distracting factors such as night glow.

Askar SII filters can effectively capture targets of emission nebulae, planetary nebulae and supernova remnants that release SII particles. The deep red light emitted by SII has a very different character to the light emitted by the surrounding H-alpha, giving a totally different image detail in the SII region than in the H-alpha region. So, when you are photographing nebulae emitting SII, use the Askar SII narrowband filter. 3nm bandwidth and high transmission at the central wavelength allow the Askar SII narrowband filter to enhance the contrast and detail of images of emission nebulae, planetary nebulae and supernova remnants.

3nm SII Filter 2”
FWHM: 3nm
CWL：672nm
Peak transmittance：90%
Barrier property：≥OD5 @ 200-1100nm
Thickness：1.85 ± 0.05mm
Surface finish：60/40
Parallelism：30″

Askar 3nm H-alpha Filter

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.

The Askar H-alpha filter has a center wavelength of 656.3nm, where it has 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 night glow. So, Askar H-alpha is very suitable for using in areas with serious light pollution. Of course, Askar H-alpha can effectively enhance the contrast of images when shooting in some dark places.

3nm H-alpha 2”
FWHM: 3nm
CWL：656.3nm
Peak transmittance：90%
Barrier property：≥OD5 @ 200-1100nm
Thickness：1.85 ± 0.05mm
Surface finish：60/40
Parallelism：30″

Askar 3nm OIII Filter

The Askar OIII narrowband filter is very suitable for shooting nebulae and supernova remnants that release OIII particles.

The Askar OIII narrowband filter has a center wavelength of 500.7nm, where it has an ultra-high transmittance over 90%. The highly narrow 3nm bandwidth ensures this filter effectively blocks out light pollution or other distracting lights such as night glow. Even in areas where there is severe light pollution can it ensure the imaging quality. And when shooting at some dark places, Askar OIII can effectively enhance the contrast of images.

What’ s more, the specific design of 3nm OIII filter gives it very good halation control, making the stars sharper and rounder.

3nm OIII 2”
FWHM: 3nm
CWL：500.7nm
Peak transmittance：90%
Barrier property：≥OD5 @ 200-1100nm
Thickness：1.85 ± 0.05mm
Surface finish：60/40
Parallelism：30″