Refractor DS127/820-Coronado, stopped down to 110 mm. Focal reducer. Equivalent focal length about 0.5 meters. ZWO178mm camera with UV/IR filter. Photo (a) is a composite image combining a shot of the chromosphere at the limb and the chromosphere of the disk. Direct image at 50% of original. Photo (b) is the same image, but the chromosphere of the disk is inverted, 50% of original. Noticeable turbulence, windless. AstroVetkino Observatory.
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