I'm just getting into the whole DSLR thing. I bought a D90 and I really want to be able to use it to it's fullest. I know I probably should have gotten a "beginner" one... but these things are expensive... so I decided to get the nicer one now, bc I won't be able to buy another one. So Can I have help with Camera Lingo? What does everything mean? How do they work together. Like on lenses: Right now I have a Sigma 28-70 mm f2.8, it came with the camera... but what does all that mean? What does ISO mean, how does it work, how do I use it? What do the little hoods at the end of the lens really do. I read that they keep side light from hitting the lens directly.. but what does that do to the picture? Anything else I should know? Also, can I get some good lens recommendations? Obviously, it needs to fit my D90, and I want one that would be good for outside action/wildlife shots. Any tips for taking pics at dusk? Mine always seem to come out weird... TIA for any info!!!