question re aperture on karl zeiss jena 180/2.8 pentacon 6

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TFGJR Junior Member • Posts: 33
question re aperture on karl zeiss jena 180/2.8 pentacon 6

Greetings.  The aperture on this lens seems to be stuck wide open, but I just want to be sure I'm understanding the mechanism correctly before I venture inside.  First, when the "plunger" (the silver pin) is pressed down (toward the front of the lens), you should be able to control the aperture with the aperture ring, yes?   Second, am I right that the function of an adapter would be to keep the plunger engaged so that you can control the aperture with the ring?

Thanks!

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