Baader H-alpha Enforced-Narrowband 3,5nm Filter

Baader H-alpha Enforced-Narrowband 3,5nm Filter
Starting at: € 365.00 Price excl. German VAT tax (19%): € 306.72
  • Precision grade enforced H-alpha filter for f/10 to f/3.5 optical systems
  • Opens up the extremely narrow 3,5nm H-alpha world
  • This enforced contrast results in even fainter stars, providing more signal of faintest nebulae detail
  • Manufacturing such ultra-narrow filter does require extreme coating homogeneity and very high CWL precision, which these filters are designed for. The initial production did center on the most necessary sizes (2" / 50.4 mm round and 50x50 mm square - other sizes to follow) CWL= Center-wavelength / FWHM= full width half maximum.

Note: In general this DeepSky enforced H-alpha Filter is not suitable for solar observation. The Halfbandwidth of 3,5nm equals 35 Ångstroem, high-quality H-alpha solar filter from SolarSpectrum start at 0.8 Ångstroem. At favorable conditions experiments might still be possible, although at lesser quality. Read more about it (in german) here:

We explicity warn you to observe the sund with a 3.5nm H-alpha Filter. This may be possible with a camera, but under no circumstances with the naked eye. Due to eye safety reason we must generally advise against experiments of this kind.

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Starting at: € 365.00 Price excl. German VAT tax (19%): € 306.72

Product Questions

Whats the actual size of 2" UV/IR cut filter in "mm" with and without frame/ring?
What step down adapter is suggested from a 52 mm to "-- mm"?
Question by: Waqas Ahmad on Oct 10, 2016 7:54:00 PM | 1 Answer(s)
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Additional Information

Manufacturer Baader Planetarium
SKU (#) enforced-h-alpha-3-5
Filter mounted Mounted (LPFC 6mm)

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