I just bought a Rolleiflex 2.8 a (type 1, # 1119665)) with Zeiss Opton Tessar ( # 535501). I recall Marc's nice essay telling about the factory recall to swap the Opton Tessars for the original Jena versions, but I don't remember if he said the camera was also supplied originally with Opton lenses. In contrast, I have another type 1 ( # 1114166 ) with Jena Tessar ( # 2311236). I've always liked the performance of this one, so it'll be interesting to run a comparison test.