My images of the Sun in Ca-K light are collected here below. For them I use a Baader K-line filter.
Active region 12585 close to the west limb imaged through my 130 mm solar newtonian,Baader Ca-K filter and Chameleon mono CCD.
Ca-K image of the Sun taken on April 22nd, 2017.
April 30th, 2017
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