Phone-O-Scope: A 35mm SLR Lens On Your iPhone

Don't have the big bucks for the OWLe?  No problem!

As long as you do have an iphone, some old SLR lenses and some duct tape...

Check it out:  http://blog.cow.mooh.org/2009/12/phone-o-scope-attaching-slr-lenses-to.html