| 摘要 |
An electrically operated camera is operated automatically from between far-focus and near-focus lens settings responsively to ambient light sensings. The far-focus lens setting is less than infinity. Under strong lighting conditions, the aperture is automatically set between a range of values, the largest of which is no greater than the hyperfocal aperture value corresponding to the far-focus setting of the lens, thereby setting the outer boundary of the depth of field at infinity. In weak light, a flash system is automatically enabled, the lens is set to a near-focus position, and the aperture is automatically set at its maximum value. Timed energization of a single electrically operated solenoid is used to establish all settings in both modes. An additional macrofocus setting is provided for setting the lens at a focusing distance much shorter than the near-focus setting, and the aperture is automatically set at its minimum value in flash mode, or over a range of values according to ambient sensings when bright lighting conditions prevail.
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