Hey guys I am buying a 70-200mm f/4.0 (non-IS) on craigslist this week. I am going to meet the guy in NYC. I know people from NYC can SOMETIMES be a little shady, so when trying out this lens, I am asking for a little help on what to look for. So, when im seeing the lens before I pay the guy, what should I make sure works good and stuff? like what should I do with it? I know these so far: zoom in/out see if it autofocuses fast and quiet like it should check glass for scratches and what else do you guys think? Since I have never had an L lens, i just want to make sure i check ALL the features (some that may not be on sub-L lensnes) to make sure the lens works 100%. **I am not meaning to offend anyone by saying SOME NYC ppeople are shady, just that it is a known area for scammers and such. I am fully aware that MOST people from there are nice fine people. I am just making sure I get a good lens and not scammed.