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


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