I am getting myself interested in photography and I have a few questions... 1) What camera should I get? I have a tight budget ($300) and I will be buying used, so it doesn't have to be $300 when new, just $300 when used (on eBay). I will be using the camera for macro shots(60mm), sceneries, landscape, and portraits. I don't need anything too professional. EDIT: After looking, the only ones $300 or under, I found used... are Nikon D40 and D50... which would be better for me? 2) Do Nikon lens' work with canon cameras? and even the other way around.