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| p.1 #4 · Canon FD expert help needed! Len stuck wide open |
With the FD's (silver nose & SSC's) you can push the aperture lever up till it stops, and push it some more till it reaches the end of the slot, it should stay there, now the aperture should open and close as you turn the aperture ring, if it doesn't, a previous owner may have opened the rear up and not put it back together correctly, I so I can help if needed.
This should help you fix it if it was put together wrong, I've done it a few times when doing a full clean & relube.
FD 50/1.4 assembly