<p>does anyone know the extinction coefficients for hydrogen alpha, oxygen III and sulphur II narrow band filters?
I easily found the coeffs for BVRI filters but can't find info on narrowband filters.
Thanks</p>

CC BY-SA 4.0
2022-07-19T14:15:30.290Z
Maybe some here are helpful: http://astrosurf.com/viladrich/astro/instrument/filters/Filters.html.
Ed V
CC BY-SA 4.0
2022-07-19T14:25:20.167Z
And more: http://www.astrosurf.com/buil/filters/curves.htm.
Ed V
<extinction>
Extinction coefficients for narrow band filters
Adrian
# Extinction coefficients for narrow band filters

(Asked by: username_0 on 2022-07-18)

does anyone know the extinction coefficients for hydrogen alpha, oxygen III and sulphur II narrow band filters?
I easily found the coeffs for BVRI filters but can't find info on narrowband filters.
Thanks

**Tags:** extinction

> **Comments:**
> **username_1**: Maybe some here are helpful: http://astrosurf.com/viladrich/astro/instrument/filters/Filters.html.  
> **username_1**: And more: http://www.astrosurf.com/buil/filters/curves.htm.  

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