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Antlia 3nm Ha, SII and OIII Pro Narrowband Filters

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The Antlia 3.0nm filters is suitable for imaging emissions from nebulae, planetary nebulae and supernova remnants.
The 3.0nm bandwidth delivers a high transmission at the centre wavelengths. The extreme narrowness in bandwidth enables astro-imaging from heavily light polluted locations and delivers improved contrast at darker sites. The filter effectively suppresses interference from other wavelengths, especially artificial mercury and sodium lamps.
Antlia narrowband filters are designed to bring out the faintest features in nebulosity by reducing the unwanted background frequencies.

The narrower the filter, the better. Our H Alpha filter is designed to deliver 90 % transmission at the 656.3nm line. The out of band blocking specification is rated OD3 (0.1%) which delivers an excellent signal to noise ratio and effective cut off rate to minimize interference from other wavelengths.
A sharp cut off rate is a very important performance index since it is designed to sharply attenuate off-band wavelengths. The result is that the Antlia Ha filter delivers excellent contrast with extremely dark backgrounds whilst delivering a high transmission of the Ha signal. The sharp cut-off also minimizes the effect of halos around bright stars.
In the production process, we use very strict quality control standards. Each filter is individually tested and scanned to ensure that the product meets our high-performance parameters. Our exacting attention to tolerances requires each substrate to have a uniform thickness that achieves no more + -0.05mm deviation from specification.

Application and Performance:

  • Ultra-narrow 3.0 nm bandwidths, designed for astronomy imaging in both light polluted areas and at dark sites;
  • Suitable for imaging of H-Alpha emission in nebulae, planetary nebulae and supernova remnants;
  • With the Ha, SII, OIII set of filters you are able to process your images to achieve the impressive Hubble colour palette;
  • With the Ha and OIII filters these can be used to achieve great narrowband results using the Bi-Colour process;
  • High transmission of typically 90% and sharp cut-off delivers an excellent boost in contrast for Ha emitting objects;
  • All Antlia Narrowband filters are edge blackened to minimize interference from stray light;
  • This filter is not suited to deep sky objects that do not contain Ha emissions. It can be used to image Ha regions in galaxies and such images can be combined into LRGB images to better highlight the Ha emitting regions of galaxies.

Specifications: Antlia 3nm Ha, SII and OIII Pro Narrowband Filters

What's in the Box

What's in the Box: Antlia 3nm Ha, SII and OIII Pro Narrowband Filters

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