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Author Message   John_shriver Tinkerer Username: John_shriver Post Number: 2 Registered: 12-2006 Rating: N/A Votes: 0 Posted on Tuesday, December 05, 2006 - 06:25 pm:    Same camera as the Topcon PR-II, which might help in finding service info. DeJur-Amsco was the US importer for this model. According to Antonetto's book (Topcon Story), it's got an exotic picture taking sequence: 1. Iris stops down 2. Shutter closes 3. Mirror rises 4. Shutter operates for exposure 5. Mirror falls Then when you wind the shutter is re-cocked. Leaf shutter Topcons are feared by many, repair-wise.