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Author Message   John_s Tinkerer Username: John_s Post Number: 19 Registered: 07-2009 Rating: N/A Votes: 0 Posted on Tuesday, June 22, 2010 - 02:49 pm:    I tried putting silver foil over the patches, but it made no difference. Silver paint might be better. I think these pentaprisms rely on total internal reflection to reflect the light, the silvering just improves things slightly. When the silvering is removed, the plain glass still reflects the light but the edges can be seen.