i love the way you got so close to the bee's, you must have very fast button like reflexes,i've tried getting close to the bees but just as the camera focus locks,they would busy themselves off to the next flower, i wish i could get close and so great shots as you have pulled off.
I used my Quantaray 70-300mm for these...it has a macro setting, so I didn't have to get super close to any of these (which actually made me happy...lol). I just got within about 5-6 feet and tried to stay as still as possible. With the bees, if you start focussing as soon as they land on the flower, you have a small amount of time to grab a shot...then they pop over to the next one.