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Author Message   Rick_oleson Tinkerer Username: Rick_oleson Post Number: 1320 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Monday, June 24, 2013 - 08:30 pm:    Mechanically they've been fine, even the late 4AM (the f/1.8 Helios lens is also terrific), but the light leaks can be frustrating. Generally the light comes in the small RF window and down the sprocket shaft, and it's hard to plug up because of the moving parts along the way.