iPhone DSLR Prototype 1.0 Attaches a Lens and Body to Your iPhone
The creator of the iPhone DSLR Prototype, Jeremy Salvador, says it best. "Why pair an iPhone 3G, iPhone 3GS, or iPhone 4 with a DSLR lens? Why not!"
Because of the iPhone's limited image sensor and the impracticality of shooting through a mounted lens, this could really end up being more of a downgrade than an upgrade, but boy is it interesting.
The prototype uses a solid piece of anodized aluminum for the housing and weighs in at just over a pound. It's got two handle grips and four different threaded holes so that you can attach it to a standard tripod.
The current version only takes Canon EF lenses, but Salvador says that with the right adaptors, he'll have it handling Canon FD, Nikon and M42 lenses as well.