Like macfred, I, too, have the Zeiss Super Ikonta III with the Tessar lens on mine. I've sold off most of my other folders, but this one I will keep forever; like it a lot! However, please heed the all the warnings concerning buying a folder. I bought my 531/16 from a well respected dealer and paid top $$$ for it. After the first roll, I noticed the focusing was not right; that is, the negative was not sharp where I set focus. I contacted the seller and he graciously offered to let me return it and he'd look it over. Upon return of the camera to me, he assured me that the issue was fixed. I ran a second roll through it to test, and it was still not right. I finally contacted and sent it off to Ken Ruth, before he retired, and I didn't have it for six months! Ken fixed it, but the repair cost me about half again the original cost of the camera. I was not particularly pleased that I had to spend the extra bucks getting it fixed--mainly because I didn't pay a "fixer upper" price for the camera--but, I was happy that focus was now correct and I've enjoyed using it ever since. Buyer beware!