Using a setup I no longer have, an Atik camera, I made a mosaic of the Sun with the N150/750 tube, through the Baader K-Line Filter 1.25″ (double stacked) filter. I processed it back then, and reprocessed it now. It shows the difference.

Calcium K (2015)

Calcium K (2015)

Calcium K 2015, reprocessed in 2021

Calcium K 2015, reprocessed in 2021

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