I have used my old Vivitar One 800 f/11 solid cat with several DSLRs including my 80D. Results are good enough for my application, but I find it increasingly difficult to confirm focus visually or with Live View. I believe it's my aging eyes. I want to add a focus confirmation chip adapter to the T Mount to provide data to the 80D. Exposure information would be nice, but I generally shoot in manual with that lens because shots are rarely spontaneous and there is plenty of time to prepare. Still, is it possible to get one preset to f/11 instead f/1.8 like most are?