I have a Nikon D40, and I have two lenses for it, one is the standard lens that comes with it, and the second is an average telephoto. I use my camera alot to take pictures of my kids, but the standard lens and the zoom lens will not let me take the photo if I am standing to close to them. Wether it is in auto focus or manual, it wont even let me take the photo, I have to keep backing up. However I want those really close up shots. What kind of lens should I use to be able to get shots of my kids or anything close up? And what exactly does a wide angle lens allow you to do? I don't know what the technical terminolgy is for all the equipment and things like that, so if I could get a easy to understand explination that would be great.