| 摘要 |
A rod 24 pivots inside a lens barrel. Movement of level 1 by depressing the shutter release allows link 20 to pivot. Pin 22, fixed on the link drives lever 26 to pivot rod 24. Lever 27 slides along rod 24 as the lens is extended but is fixed to move pivotably with the rod. to drive a second link 32. The diaphragm blades are mounted on ring 34 which is rotated by the second link 32 through pin 35. Cam 41 limits the travel of link 32 in accordance with the pre-set f-stop.
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