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

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Baader H-alpha Enforced-Narrowband 3,5nm Filter
From: € 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: www.astrosolar.com/sonne-im-astrosolar-h-alpha

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

Product Questions

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Whats the actual size of your 2" filters in "mm" with and without frame/ring?
What step down adapter is suggested from a 52 mm to "-- mm"?
22
Question by: Waqas Ahmad on Oct 10, 2016 7:54:00 PM | 1 Answer(s)
Hello! I've got filter set h-alpha,h-beta,sII,oIII for full frame ccd, when will arrive the filter size 1.25" for h-alpha 3.5nm?
7
Question by: Nazario Montuori on Apr 30, 2017 11:39:00 PM | 1 Answer(s)
Do all Baader narrowband filter both UV and IR as well? I am thinking of using them with a Full Spectrum DSLR. Thanks.
5
Question by: Jon on Nov 1, 2016 11:59:00 PM | 1 Answer(s)
I understand your 3.5nm Ha filter in 1.25" size will become available later this year. When will you produce 3.5nm filters of the same size in SII and OIII? Thank you.
2
Question by: Peter on Jul 3, 2017 10:44:35 PM | 1 Answer(s)
What are the threads and pitch of your 1.25" and 2" filters?
-1
Question by: Anders G. on Sep 20, 2017 12:55:00 PM | 1 Answer(s)
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