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The effect of seeing: M 1 (Crab Nebula) seeing - 2.4". Hover the mouse over the image to see it with better seeing - 1.0'' RVB 360 360 600 sec., 2 m RCC telescope at NAO Rozhen, VersArray 1300 B CCD camera at -110° C , collaboration with Niki Petrov and Yanko Nikolov |