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Steffen Be.: Sun 01/05/2011 CaK
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Steffen Be.: Sun in Calcium K-Line light
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Steffen Be.: Sun in Calcium K-Line 10th May 2012
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Steffen Be.: H-Alpha & Calcium K-Line
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Steffen Be.: Sun on 5/17/2012
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Steffen Be.: H-Alpha & Calcium K-Line 20120527
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Steffen Be.: Sun on August, 1st. 2012 in H-Alpha, Whitelight and Caclium K-Line