crwdns2934241:0crwdne2934241:0 Harry

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Aperture blades won't open

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Using a nikon n80/f80  , with nikkor 50mm 1.8g afs and the aperture blades won't open when I press the shutter of the dof preview button, it's stuck at f16/22 . Everything else works fine , is there a fix?

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Nikon N80

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open