I'm not sure if that's the right section to post this question, but here it is anyway. There is an auction on Ebay for "Contax Carl Zeiss 200mm f3.5 Tele-Tessar T* manual focus lens made in W. Germany" right now. Since this lens has been discontinued such a long time ago, I couldn't find much info about it. Does anyone know where can I find old MTF sheets (if available) for this lens? And how does it compare to Sonnar 180mm f/2.8 ? Is it worth buying at all and if so, at what price?