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Anonymous
Fire the shutter in each speed, you should hear a distinct differentiation between each one. If that woks, open up the camera back and cycle through a few exposures. Make sure the shutter is opening and closing completely and that the take-up spool is turning when you wind the lever. Next, remove the lens then look through it and rotate the aperture ring to each stop. You should see a corresponding change in size for each stop, and the changes should be crisp and quick. Clean the front and rear elements as needed (using lens cleaner or rubbing alcohol and a soft cloth) then look through the lens. It should be perfectly clear.
Any haze or fuzz indicates fungus on the glass which may or may not be easily fixable. If you can get to the fungus without disassembling the lens, you can often remove it with rubbing alcohol and a lot of vigorous scrubbing with a soft cloth. If the lens is coated, the fungus will likely permanently damage the coating, but given the age of the camera it probably isn't. Fungus can also etch the glass, in which case the haze will remain even if you manage to remove the fungus. There isn't much you can do at that point other than buy a new lens on ebay (they're cheap)
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