EF-S 60mm f/2.8 Macro. Hand-held, natural light.
With a tripod and a good MF screen (or Liveview) one could try to sink deeper into the Alice-in-Wonderland type of floral imagery in those water droplets.
I'm a bit of a n00b, I've only had my camera for a little more than a year, and my macro lens for half of that. Here are my best flower shots in chronological order.