I have an opportunity to purchase this lens for a reasonable price. I have looked at this lens and it looks quite good really despite its age (1980 ish ?) But when I put the lens on a camera and stopped down setting no matter what I set the aperture to anything the lens remained at it's wide open position. I have tried this on many FD lenses I have purchased and the aperture always worked properly. Is there something I am doing wrong with this lens or is it a defect with this particular lens. For the price they are going for I want it to be 100% sure I am not buying a one that will cost me to repair after buying.
