| 摘要 |
PURPOSE:To obtain an easy and accurate transilluminating device with simple constitution, by using a fluorescent lamp to adjust the focus and determine the exposure and obtaining a proper quantity of the exposure light for strobe photography. CONSTITUTION:Such aperture value of a photographic lens is determined that the quantity of exposure light on the image plane is proper for a desired film sensitivity in accordance with the length from a strobe light emitting tube 11 to an object on a transparent set plate 6, the guide number of the strobe, etc. When this aperture value is set, a required shutter speed for the proper quantity of exposure light is obtained by the TTL photometry. Next, when fluorescent lamps 9 and 10 are lit and a camera 1 is focused to the object by the irradiated light through a light diffusing plate 7, the proper shutter speed due to the TTL photometry is different from a required shutter speed in accordance with the F value, the magnification, etc. When the aperture value is so adjusted that these shutter speed coincides with each other, fluorescent lamps are extinguished to obtain a proper quantity of exposure light due to lighting of the light emitting tube 11, and thus, an easy and accurate transilluminating device with simple constitution is obtained where the TTL photometric device is used. |
