| 摘要 |
The iris light aperture stop (1) has a stationary fixing ring (2), a rotary setting ring (3) and a number of iris lamella elements (4), controlled by rotation of the setting ring for continuous variation of the size of a light aperture (5) between a maximum aperture size and a minimum aperture size. The setting ring has an attached coupling drive (6) with at least 2 flat levers (7,8), driven by a rotatable operating element (9), with a shutter element (11) attached to one of the levers for movement in front of the light aperture upon reaching a given aperture size.
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