Goods can be purchased
- directly from our offices
- online
- on takealot.com
- or loot.co.za
First floor
44 The Avenue, The Gardens, Johannesburg, South Africa
Office Hours
Monday to Friday
9 a.m. to 5 p.m.
Saturday and Sunday
Closed
Shop Now
Askar Duo-Band Narrowband Filter
The Askar Duo-band narrowband has two passbands, which is quite different from those single-band narrowband filters thus more economical and efficient because astrophotographers don’t need to purchase a filter wheel or a whole narrowband filter set. And imagers don’t have to buy a monochrome astronomy camera as the duo-band narrowband filter performs well with ordinary colour cameras. So the duo-band filter is an economical alternative for astrophotographers whom prefer to use a colour imaging camera and wish to enter the world of narrowband deep-sky imaging.
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 heavily light-pollution hit locations and delivers enhanced contrast at darker places.
The Askar duo-band filter is designed for improving 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 the blocking range of 200-1100nm. 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. You can expect high performance from this duo-band filter in artificially-brightened background skies with one shot colour CMOS and CCD Cameras.
Works With the Dwarf II as Well
Established in 1991, GIT has prided itself on providing our customers with personalised service and support for over 30 years.
We import and supply a Range of Astrophotographic, Optical, an d Audio products to our customers. All products are supported locally by ourselves.
Not sure about buying online? Feel free to set up a time to meet at our offices in Norwood Johannesburg where we can discuss and assist with your buying decision.
Thank you Laurence, the unit works very well with the speaker arrangement I have and has a clear sound, it has brought new life to these since my amp blew many years ago. Vaughan
Online-sales
Graphic Image Technologies (Pty) Ltd
GIT was established in 1991. We provide solutions to the broadcast and security markets.
We offer a range of quality Astrophotography, Optics and Audio Amplifier solutions. Please feel free to contact us should you have any questions.
More information is available on our main website at: https://www.git.co.za
Goods can be purchased
- directly from our offices
- online
- on takealot.com
- or loot.co.za
Office Hours
Monday to Friday
9 a.m. to 5 p.m.
Saturday and Sunday
Closed