Tal-250K, prime focus 2150 mm, ASI ZWO178mm camera, UV/IR filter, 100% scale from original, crop. Seeing conditions during imaging approximately corresponded to 1-2 on the Antoniadi scale. Windless, light haze. Observatory "AstroVetkino" https://astronomy.ru/forum/index.php/topic,158764.0.html
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