Phone-O-Scope: Step 5
The slightly odd Phone-O-Scope, which is an adapter to affix SLR lenses to iPhones.
Build instructions and more details are here.
Components for the actual coupler. I used an old lens cap, and two pieces of two-inch PVC pipe connectors. It was important that the connectors could be connected via a screw thread - this way we can move the whole SLR lens back and forth for secondary focusing.