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Author Message   Mike Kovacs Rating: N/A Votes: 0 Posted on Wednesday, March 22, 2006 - 06:21 pm:    Can anyone help get me into this Biotar? It really has me baffled. Nameplate unscrews, front cell unscrews, rear cell moves but just turns and turns (unless its the longest thread I have ever seen) There are no screws anywhere that I can see to get into the aperture and helical. Is is one of the same vintage as the Contax D its attached to. Bright aluminum barrel, preset aperture.