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

Images uploaded by Customers

No customer Image uploads yet. Add Your Review with Images
Baader Ultra-Narrowband H-alpha 3,5nm Filter

Please choose product variant from dropdown below to see SKU number

€ 257.00 Price excl. German VAT tax (19%): € 215.97

Please choose product variant from dropdown below to see stock status  


  • 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. CWL= Center-wavelength / FWHM= full width half maximum.

Note: In general this DeepSky Ultra-Narrowband 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 sun 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.

* Required Fields

€ 257.00 Price excl. German VAT tax (19%): € 215.97

Product Questions

Sort by ASC
What's 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"?
Question by: Waqas Ahmad on Oct 10, 2016 7:54:00 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.
Question by: Jon on Nov 1, 2016 11:59:00 PM | 1 Answer(s)
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?
Question by: Nazario Montuori on Apr 30, 2017 11:39:00 PM | 1 Answer(s)
What are the threads and pitch of your 1.25" and 2" filters?
Question by: Anders G. on Sep 20, 2017 12:55:00 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.
Question by: Peter on Jul 3, 2017 10:44:35 PM | 1 Answer(s)
Are you developing a 36mm unmounted version of this filter?
Question by: Paul Tribe on Nov 30, 2017 2:43:00 PM | 1 Answer(s)
Do you have any plans to make a 1.25" of this filter?
Thank you,
Elias Galanis.
Question by: Elias Galanis on Jan 24, 2018 3:18:00 PM | 1 Answer(s)
Related Articles

Additional Information

Technical Data not yet specifiedPlease choose product variant from dropdown above to see technical data of your chosen product

You may also be interested in the following product(s)

Tell us what you think about this item!

Write A Review
    Please, wait...