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Author Message   Ben_hutcherson Tinkerer Username: Ben_hutcherson Post Number: 10 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Monday, September 25, 2006 - 01:28 pm:    About all you can test with a lens is make sure that the aperture opens and closes, and make sure the lens focuses correctly. If you point the lens at something far enough away and focus, it should be right at the infinity stop. Anything closer and you should at least be close to what the focusing ring indicates. Beyond that, run some cheap print film through it and see what happens. Once you're satisfied, try some slide film and see how close the apertures are to their stated value.