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Author Message   Glenn Tinkerer Username: Glenn Post Number: 505 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Monday, January 26, 2009 - 05:26 pm:    Get yourself a nice sunny day, a brick wall, tripod and camera loaded with film, surely I don't have to go into any more details. If you also measure the distance from the wall to the film plane with an accurate tape, you can also check that the focusing scale is reasonably accurate. Just check the resulting negatives with a good magnifier and remember to always use maximum aperture to expose them.