Chroma’s narrowband astronomy filters are engineered to deliver exceptional transmission, blocking, and spectral precision across a wide range of optical systems. Because filter performance shifts with beam angle (f/#), we provide detailed, measured spectral data at multiple f/# configurations to ensure accurate system design and optimal imaging results.
For convenience, you can download the full library of narrowband filter data—including all available f/# configurations—in a single package:
Use the table below to explore available datasets for each filter and f/# configuration. Click the link to download the spectral data.
Filter
Data
27001 H-alpha 3nm
Collimated
f/2
f/2.5
f/3
f/4
f/5
27002 H-alpha 5nm
27003 H-alpha 8nm
27004 H-beta 3nm
27005 H-beta 5nm
27006 OIII 3nm
27007 OIII 5nm
27008 OIII 8nm
27009 SII 3nm
27010 SII 5nm
27011 SII 8nm
27013 NII 3nm
27065 H-alpha 3nm f/3 Optimized
27066 OIII 3nm f/3 Optimized
27067 SII 3nm f/3 Optimized
27068 He-II 4nm
10 Imtec LaneBellows Falls, VT 05101 USTel 800-824-7662Fax 802-428-2525sales@chroma.comMedia Queries: media@chroma.comTerms of Use Privacy Policy
Science, it's in our DNA!™
© 2026 Chroma Technology Corp. All rights reserved.
Please check the spelling or try searching with different keywords.
You can also explore the following sections for more information:
If you need further assistance, feel free to contact us:
We're here to help you find the optical filter solutions you need.