Originally Posted by
StuartR
Hello all,
I just received a lovely 150mm APO Sironar W in the mail, mounted in a prontor professional 1 shutter. The lens and shutter appear in good shape, though a bit used (they look like they were sitting in a corner somewhere for a few years/decades, but otherwise just fine). The speeds seem accurate and when I got the shutter, the aperture was moving somewhat freely. However, when I tried the secondary cable release port for opening the shutter and iris for focusing, the iris first would close very slowly, and then not at all. Currently it is stuck wide open, and I cannot find a way to bring it back into position. It does not respond to the movement of the ring, nor the shutter. I can see a small lever with a post on the inside of the lens that moves in relation to the secondary cable release, but it moves freely...it does not pull the aperture back into place as it appears it should.
I called SK Grimes, and they were not able to help, and the service bureau they recommend (Flutot's) seems to be closed. Does anyone have any advice? Or perhaps a service manual? I do not think the issue is severe...probably just a bit of oil or gunk in the system or a disengaged connection in the iris mechanism.
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