Telephoto Lenses Pertaining To People Photography And Telephoto Lenses?

Pertaining to people photography and telephoto lenses? - telephoto lenses

What cheap lenses can I expect? I need to get a telephoto lens for high school graduates, I will attend, and I'm soon Nikon D40. For the Sigma and Tamron have been there, they all belong to the macro photography? Would that work well for photographing people? Any suggestions would be nice.