Uploaded September 2025 | Updated September 2026, 34 minutes ago

---

Calcium K is a near ultraviolet wavelength in the Sun that reveals plage and magnetic fields. It's in between Hydrogen Alpha/Chromosphere imaging and broadband/white light imaging.

Agena Astro let me borrow a Calcium K filter for evaluation and use in this tutorial - Thank you!

If you found this video of interest, and are considering investing in a Calcium K filter or other astronomy gear, I would appreciate you using my Agena Astro affiliate link. If you make a qualifying purchase it will cost you nothing, but I will receive a small commission. Much appreciated!

Agena Astro: bit.ly/3qfWaZS

Curious about astronomy? Ask me anything! azastroguy@gmail.com

Like what you see? Follow me @azastroguy on all popular social media platforms. I post daily on Instagram, Threads and Facebook.

I put a lot of work into these videos. It really helps if you subscribe to my channel. Thanks.

Want to buy me a coffee? It's appreciated! buymeacoffee.com/azastroguy

#astronomy #solarimaging #suneffect