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The Baader K-line filter comes with 3.8 AstroSolar 200x290mm filter and it is designed exclusively for photographic use with CCD-cameras (especially monochrome cameras). It is not intended for visual observation. Never use this filter without the Astrosolar to be installed in front of the objective. Please remember: Never look into the sun with the K-Line filter without an additional OD-reduction filter!
Calcium-K-light (at around 390 nm) is emitted from a layer of the sun which is about 500 km above the photosphere. Basically, you look into the boundary layer between upper photosphere and lower chromosphere, while H-alpha-light at 656.28nm is emitted within the upper chromosphere, which marks the boundary layer between the chromosphere and the inner corona of the Sun. The solar disk appears blue in CaK-light, exhibiting a network of structures in the chromosphere which appears much brighter. These bright “plages” are usually associated with faculae and sunspots in the photosphere - and these plagues can be seen all over the sun.