ASI 178MM (cooled), IR850nm 20nm fwhm, Skywatcher 72/420 ED-APO, ND5, mountpusher, EQ3-mod — I believe this image shows the Calcium Triplet

For comparison, here’s the Baader CaK 5nm image
And while at it, the Altair G-band image too

Solar Continuum 7.5nm

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