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The Beijing Faint Object Spectrograph and Camera (BFOSC) is one of the mostimportant instruments of the 2.16-m telescope of the Xinglong Observatory.Every year there are ~ 20 SCI-papers published based on the observational dataof this telescope. In this work, we have systemically measured the totalefficiency of the BFOSC of the 2.16-m reflector, based on the observations oftwo ESO flux standard stars. We have obtained the total efficiencies of theBFOSC instrument of different grisms with various slit widths in almost allranges, and analysed the factors which effect the efficiency of telescope andspectrograph. For the astronomical observers, the result will be useful forthem to select a suitable slit width, depending on their scientific goals andweather conditions during the observation; For the technicians, the result willhelp them systemically find out the real efficiency of telescope andspectrograph, and further to improve the total efficiency and observingcapacity of the telescope technically.

Investigating the Efficiency of the Beijing Faint Object Spectrograph and Camera (BFOSC) of the Xinglong 2.16-m Reflector