Why this fixation on Tessar? Are the other optical formulas not able to give a picture? I had by the past a Ricohflex (triplet lens) giving very nice results save the light coating... Same thing with an Ikoflex... The most important with these cameras is to make sure they are fine tune and that what you see is what you get (i.e., both viewing and taking lenses are matching). This is a prerequisite for fully using lens capabilities.