Howdy everyone, I'm really not sure if I'm asking this in the right forum, but I noticed that you also cover Canon lenses as long as they have the Leica screw mount (and I'm assuming here that all Canon lenses with a screw mount have the Leica screw mount). Well, I've come into possession of a screw mount Canon 1000mm f/11 (complete with its own aluminium case), a whopper of a lens! It also has "Rset" written on it, but I've no idea what this means. My questions for those familiar with such lenses are: 1. Can you tell me if my identification of this lens correct? 2. How many of the people here are still using Canon screw mount lenses? 3. Does this 1000mm f/11 have a good reputation? (Is it a good lens?) 4. What are your estimates for a current price/value? (It seems to be in good to very good condition.) Appologies if I have posted to the wrong forum, but if anyone can help me out with information, I would be grateful!