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Published online by Cambridge University Press: 26 July 2016
Surface photometry techniques of data processing are applied for the qualitative analysis on the reflectivity of the two mirror system in the prime focus of the 2m Ritchey-Chrétien Coudé telescope of the Rozhen Observatory. There are considerable variations in the reflectivity, up to ±30%. An estimation on the upper limit of the average reflectivity, about 68% ±1%, of the two-mirror RC system is made. A loss of about 0.5 magnitudes in the limiting magnitude due to the low reflectivity and to the decrease in the reflecting surface is found.