Askar Duo-Band Narrowband Filter
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Askar Duo-Band Narrowband Filter

£139.00
  (2 Reviews)
✓ 2 year warranty
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Out of stock due 90-120 working days

About this product

Model:  askar_duo-band_fltr_125
Part Number:  1.25 Duo-Band

This Askar duo-band filter is an economical alternative for astrophotographers who prefer to use a colour imaging camera and wish to enter the world of narrowband deep-sky imaging.

The filter has two passbands and performs well with One Shot Colour cameras, so it is an excellent choice for astrophotographers who don't wish to purchase a mono camera, filter, wheel and narrowband filter set. 

The Askar duo-band filter is suitable for imaging emission nebulae, planetary nebulae and supernova remnants. The Askar duo-band filter has an extreme high transmission at a centre wavelength of 500.7nm (O III) and 656nm (H-alpha). Narrow bandwidth enables this Astroimaging filter to block all the light pollution and other unwanted artificial lights or night glow. So the Askar duo-band filter is an ideal instrument for astro-imaging in locations with strong light-pollution and delivers enhanced contrast at darker places.

The Askar duo-band filter is designed to improve the contrast and details of nebulae and supernova remnants. The Askar duo-band filter can bring out the highest amount of detail within emission nebulae, planetary nebulae and supernova remnants. Also, the out-of-band blocking ability is rated with OD3 (0.1%) with a 200-1100nm blocking range. It delivers an excellent signal-to-noise ratio and a sharp cut-off rate to attenuate the disturbance from other wavelengths.

The narrow bandwidth and an effective cut-off rate are important features when choosing a narrowband filter. The Askar duo-band filter has a narrow bandwidth and an extreme transmission of over 90% at 500.7nm and over 80% at 656nm whilst sufficiently suppressing other off-band wavelengths. So, the Askar Duo-Band filter can efficiently reject all the light pollution. With One Shot Colour CMOS and CCD cameras, you can expect high performance from this duo-band filter in artificially brightened background skies.

Customer reviews

Average Rating (2 Reviews):  
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Little belter
28 February 2024  | 

I have been blown away with the results from this. Lovely small tight stars (no halo's) and got a cracking california image off just 80 minutes in near full moon.

When I bought it the 1.25 extreme wasn't available, it was a no brainer. Now the 1.25 extreme is available, I might have popped for it as I believe it has a very slight edge but in tests I have seen, there is very little between the two. Neither would be a bad purchase but the askar wins if on a tighter budget.


Rating (max 5):  
Askar Dual NB filter
06 January 2023  | 

Managed to get out and test this filter bit long after it (very quickly) arrived. On paper it appears to be a good competitor to the L-Extreme, both being 7nm in Oiii and Ha, although I'm aware the L-Extreme has issues with halos at times. Did a couple of test hours with the Askar on the Jellyfish Nebula and the Heart Nebula during an 80% moon. I had no halos, and the blocking abilities were fabulous. Would actually recommend this over the L-Extreme, especially as it's cheaper!

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