| 摘要 |
PROBLEM TO BE SOLVED: To allow light quantity adjustment in color photographing and monochromatic photographing and to obtain a sufficient video.SOLUTION: A light quantity adjustment device includes: an imaging lens group; an ND filter 14 which limits a light quantity of light transmitting through the imaging lens group; an imaging element 8 which converts the received light into an electric signal; and an infrared light cut filter 6 for preventing incidence of infrared light to the imaging element 8. The ND filter 14 at least includes: a visible light wavelength adjustment region for limiting transmission of a visible light wavelength; and an infrared light wavelength adjustment region for limiting the transmission of the infrared light. When color photographing is performed, the infrared light cut filter 6 is inserted onto an optical axis L and the visible light wavelength adjustment region of the ND filter 14 or a transmission region which does not limit the transmission of the light is inserted onto the optical axis L. When the monochromatic photographing is performed, the infrared light cut filter 6 is removed from the optical axis L, and the infrared light wavelength adjustment region of the ND filter 14 or the transmission region which does not limit the transmission of the light is inserted onto the optical axis L. |
