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Author Message   Rick_oleson Tinkerer Username: Rick_oleson Post Number: 1113 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Friday, November 05, 2010 - 07:27 pm:    I would suspect the film not lying flat in the focal plane. A misassembled lens would make the image bad (probably vastly worse than these) but it should not affect the shape of the edges of the frame. Also, while it is easy to get the center element of a triplet in backwards, a complex lens like the one on the Demi S is less likely to allow this sort of thing to happen and still get it back together.