The Sun in Ca K-line light

A Seestar S50 was used to capture a 3 minute RAW AVI Through a Baader OD 5.0 solar filter and a Baader Ca K-line filter (using an adapter kindly 3D printed by John Beer), controlling the brightness, exposure and gain so that the blue channel was not overexposed. The best 50% of the frames were debayered and stacked in Autostakkert!4 with 1.5 Drizzle. The blue channel was wavelet processed in waveSharp and post processed in the Gimp 2.10.

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The Sun in Ca K-line light 

Steve Wainwright and Nicola Mackin