Phone-O-Scope: SOMA image comparison
The slightly odd Phone-O-Scope, which is an adapter to affix SLR lenses to iPhones.
Build instructions and more details are here.
Comparing iPhone to Phone-O-Scope images - iPhone on left, Phone-O-Scope on right. Note the odd barrel distortion and vignetting in the Phone-O-Scope image. Taken with the 18-55mm lens.