Sunspot complex in CaK by Jim Thompson (2020-03)

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Sun-CaK captured using a 98mm apochromatic refractor with 4x Barlow lens for a total focal length of 2470mm, and a ZWO ASI290MM planetary imaging camera. The image is a stack of the best 200 frames from a capture of 3000 using an Omega Optical Calcium-II K (393.4nm) bandpass filter with one Angstrom bandwidth.