Not with DSLRs. They're big and expensive and so are the lenses. I mean, you can digitally change focus but it looks baaaad. That's all got to do with lenses, not like a filter or something.
Point and shoots, sure. They require no additional lenses, but they're pretty limited by not having them. Superzooms
are the way to go if into photography and just want to take cool pictures. They're still more limited than SLRs because SLRs are the only ones, (besides micro four thirds), that allow manual control of the focus.