Phone-O-Scope: Step 3
The slightly odd Phone-O-Scope, which is an adapter to affix SLR lenses to iPhones.
Build instructions and more details are here.
Take the lens stack and insert it into the cameraphone case; I again used a bit of putty to hold it into place. Just out of interest - this turns the cameraphone into a pretty decent microscope. The depth of field is rubbish (in my case, about 1-2mm) but the magnification is huge.