| 摘要 |
PURPOSE:To enable photographing to be performed by the optimum exposure time even when the luminance of the subject is low by subsequently displaying the progressing state of film exposure in the display device. CONSTITUTION:When exposure to a film is started, an integrator starts ingegration based on the information having been stored in a capacitor 45 for memory and the pointer 10A of a meter 10 turns gradually in the clockwise direction from the position of the shutter second time 2 seconds, indicating the progression of the exposure. When the shutter second time having been stored in the capacitor 45 for memory elapses and the output potential of the integrator exceeds the output potential of the voltage dividing circuit formed with resistors 28, 29, then the rear curtain of the shutter travels to end the exposure. On the other hand, the pointer 10A of the meter 10 turns up to the top end of an exposure state display plate 11, indicating that the film has attained an optimum exposure state. In this way, the photographer is able to accurately recognize the progressive state of the exposure of the film visually. |
