(a,b) - equivalent focal length with focal reducer ~0.5 meters. Photo (a) shows the chromosphere of the disk in positive, photo (b) is inverted, 50% of original size. Photo (c) - panorama of the southern part of the solar disk, mosaic of four frames of 1600x1200 pixels format, 75% of original size, cropped. Atmospheric seeing no better than 3 on a five-point scale. Variable cloudiness, light wind. Observatory "AstroVetkino" https://astronomy.ru/forum/index.php/topic,158764.0.html
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