I have owned several little Rollei 35's and still have two. One German with a Tessar and one Singapore also with a Tessar. I guess you can tell which lens I prefer. I think the Tessar seems to have better micro-contrast over the Sonnar, but that's just my feeling. That Farmall tractor above looks just like the one I learned to farm on. It was an old F-20 model and you surely built up your arm muscles trying to steer that baby. It was a snorter and did a good job for as old as it was. Ahhhhh, the good old days! JohnW