I'm interested in shooting insects. Can anyone share with me their tips on where to find insects and how best to shoot them. For example, I saw this really neat spider hanging off his web but I had a hard time focusing on him. Eventually he grew tired of me and scampered away. I've been back to his web however he either isn't there anymore or perhaps he's just shy. I'd really like to get a shot of a spider wrapping up it's prey but I'd settle for any shot I could get. I have a decent macro lens (100mm Canon prime f2) but I don't have an external flash. Will this be a problem? Do I need a longer (200+ mm) lens for good detail? Thanks in advance for your help.