Using the good old 150/750 tube, with a ND3.8 film in front, I obtained the following frames.
For reference, a Lunt CaK image, colorized and mono
And the infrared cwl 850nm, fwhm 20nm filter showing the active regions

Using the good old 150/750 tube, with a ND3.8 film in front, I obtained the following frames.
For reference, a Lunt CaK image, colorized and mono
And the infrared cwl 850nm, fwhm 20nm filter showing the active regions


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