Okay so this is my first official question here. I'm pretty much a noob when it comes to technical stuff with cameras. I've got a nikon d50 and I guess the stock lens that came with the camera package. The lens is a Nikon DX AF-S Nikkor 18-55mm 1:3.5-5.6G. That's exactly what it says on the lens. I think I have some idea what all that on the lens means, but I'm not sure. Can someone clarify for me? And how much of a better lens can I get for my camera?