| 摘要 |
PURPOSE:To perform printing in the best exposure time without any reciprocity law failure when changing photographic conditions, by calculating the exposure time by an arithmetic equation wherein the reciprocity law failure is considered. CONSTITUTION:An original and a photosensitive sheet are set in a process camera, and the values of magnification, aperture and the highlight density of the principal part are inputted from an operation board 16 to a CPU15 through an interface 14. Position detectors 18 and 19 detect the positions of an original frame 1 and a lens frame 2, and an original frame controller 16 and a lens-frame controller 17 change their positions so as to obtain optical arrangement which corresponds to the set magnification. Then, an arithmetic equation wherein a reciprocity law failure is considered also is used to calculate an exposure time, which matches to the magnification, aperture, density and kind of a photosensitive material, by the CPU15, thereby controlling a shutter 9. |
