So I got my Rebel Xti... and now what do I do? I really want to get a flash that I can use on the camera and on the tripod, but from looking around it seems I need to shell out either 1) Flash + ST speedlite transmitter 2) Two expensive Flashes One on the camera that communicates with the other flash on a tripod. Option b seems better as in future when I upgrade camera body I'd have two flashes which would be awesome. But that options seems to be around $900. Which is... well quite fu**ing expensive. Are there any suggestions you have? I'm open to learning. I know nothing about SLR's. Another thing besides flashes, is obviously lenses. I would like to achieve these few goals with lens purchases: a) low light photography (can be a non zoom lens) I was suggested to get a nifty fifty. b) shallow depth of field. c) A most versatile zoom lens. Basically a good quality lens that I can go out for a stroll not knowing what to expect and be able to take various shots. I'm still a bit confused with Canon lens groups... What do letters stand for.. L etc.? And what is the magic of Sigma people talk about? Is that a lens company that fits on Canon cameras? What's up with Sigma? Sorry for many questions. Any advice greatly appreciated.