Applications of High-Definition TV (HDTV) technologies to various fields other than broadcasting are now being explored. In particular, possibilities of motion picture film production by HDTV are eagerly under investigation. The present paper compares the noise power associated with an electrocinematographic system with that of the conventional cinematography. We found that a considerable amount of noise in electro-cinematography is noticeble especially when exposure level on the film is relatively low. The noise spectra for gray patches recorded in electro-cinematography show that peaks of noise power at 18 lines/mm in spatial frequency are observed when measured with green filter and 9 lines/mm with blue and red filters.