Baader H-Alpha 20nm Bandpass Filter
Baader H-Alpha 20nm Bandpass FilterBaader H-Alpha 20nm Bandpass FilterBaader H-Alpha 20nm Bandpass FilterBaader H-Alpha 20nm Bandpass Filter

Baader H-Alpha 20nm Bandpass Filter

£81.00✓ 2 year warranty


Out of stock due 10-15 working days

About this product

Model:  baader_2961850
Part Number:  2961850

Baader H-Alpha 20nm Bandpass Filter

This 20nm filter replaces the former, and popular, 35nm H-alpha filter, which was developed for interline CCD cameras. Due to advances in sensor technology, now much narrower filters can be used with colour sensors.

Compared to the CMOS-optimised Baader (Ultra) Narrowband Filters, the 20 nm H-alpha filter passes considerably more light. This makes the stars in the image brighter, allowing easier focusing, and the filter can be used at all focal ratios: There is no need for pre shifting as with narrowband filters. This filter is especially interesting for users of colour cameras (which are less sensitive to red than monochrome cameras) who do not need extreme narrowband filters and want to enrich their colour images with H-alpha. At the same time this filter is a valid alternative to a standard R-filter of the RGB-Set. It blocks much more light pollution than a broad band filter and still passes all H-alpha for all focal ratios. 

Warning: this filter alone is not suitable for direct viewing of the sun!

A notable difference from most H-alpa pass filters on the market is the fact that this filter includes highly efficient UV/IR blocking, being completely blocked out to 1400 nm, to eliminate blurring (“heat-noise”) caused by defocused light on refractor optics.

The Baader H-alpha Bandpass (20 nm) filter has got all the advantages of the new generation of CMOS-optimised Baader filters:

  • Increased contrast, matched for typical CMOS quantum efficiency and s/n ratio
  • Reflex-Blocker™ coatings, for largest ever freedom from halos, even under most adverse conditions concerning aux-optics
  • Identical filter thickness to existing standards, with utmost care for parfocality
  • Blackened edges all around, with filter-lead-side-indicator in the form of a telescope-sided black outer rim, to additionally eliminate any reflection due to light falling onto the edge of a filter, making additional front-masks obselete.
  • Each filter coated individually, with sealed coating edge (NOT cut out of a larger plate with coatings left exposed, read more)
  • Life-Coat™: evermore hard coatings to enable a non-aging coating for life – even in a most adverse environment


  • H-alpha filter with 20 nm FWHM (CWL 656.3 nm), thus excellently suited for visual use at night – and photographically with CCD and CMOS cameras at telescopes with all f-ratios. Warning: this filter alone is not suitable for direct viewing of the sun!
  • With new, highly effective UV/IR block coating from 300 nm to 1400 nm
  • Similar to the Super G filter in O III, the 20 nm H-alpha filter is an outstanding high-contrast deep-sky H-alpha/red filter for RGB applications, optimised for all colour CCD and CMOS chips. It enables high-contrast images of H-II regions (e.g. North America nebulae) even from light-polluted environments.
  • Front-Reflex-Blocker™ hard coated and planeoptically polished – with sealed coating edges (Life-Coat™)


Customer reviews

Be the first to Write a Review for this item!


Please fill in the form below to ask a question.

Please add the two numbers