Baader f/2 Highspeed Narrowband Filters

Baader f/2 Highspeed Narrowband Filters

  (2 Reviews)
✓ 2 year warranty



Out of stock due 20-25 working days

Supply of Baader Highspeed filters is limited at the moment - they are due in quantity in early April. Please note the 2" versions may be delayed further.

About this product

Model:  baader_f2_nb_filters_1.25_ha
Part Number:  2459393

Baader f/2 Highspeed Narrowband Filters and Filtersets.

Available in 1.25", 31mm, 2", and now 50mm Square, H-alpha, OIII and SII. Round 50.4mm filters are also in production.

These filters are designed especially for the delicate requirements of extremely fast astrograph optics, in particular Hyperstar and Celestron's New Rowe-Ackermann Astrograph (RASA).

Conventional narrowband filters cause a heavy loss in transmission due to the strong centre wavelength (CWL) shift. In extreme cases the CWL shift can cause a shift of the full width half maximum (FWHM).

The Baader highspeed narrowband filters have a CWL preshift which matches f/2 to to f/3.5 and the FWHM is also optimised. They are planeoptically polished and hard coated.

Despite the typical line broadening with such fast optical trains they are able to deliver maximum contrast. For the first time these filters allow the effective use of fast optics with high contrast emission nebulae imaging.

Using these filters when imaging between f/1.8 and f/3.5 shows a dramatic improvement compared to any regular set of narrowband filters.

Filter Spectrums

H-alpha (Hydrogen Alpha)


OIII (Oxygen)


SII (Sulphur)

Customer reviews

Average Rating (2 Reviews):  
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Baader F/2 HS NB Filters
Thursday, 23 April 2020  | 

Excellent service from FLO in tough times- brilliant!!
I have used one of the set to date (Ha). Focussing is v.hard so am now considering buying a Baader clear parfocal filter so i can setup focus first and then swap filters. Otherwise have yet to use them all in anger—-should be fine with using as NB, LRGB...

Rating (max 5):  
very good product
Thursday, 7 March 2019  | 

very good product


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