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Author Message   Jeffk Tinkerer Username: Jeffk Post Number: 25 Registered: 10-2011 Rating: N/A Votes: 0 Posted on Tuesday, November 01, 2011 - 06:42 pm:    Aperture pin not being worked? If it's an Exakta/Exa-mount Flektogon like my 20 mm, with a shutter button mounted on the lens, you have to push the button to get the aperture to close down to whatever you've set it to. Other lens mounts often have a pin of some sort that has to be pushed.