Many iPhoneographers have been looking for a macro lens that will work with the iPhone 4 and 4S to take awesome closeup images. Unfortunately, a lot of those lenses cost a few bucks -- the Olloclip (which also includes a fisheye and wide-angle lens) runs $69.99, and while the magnetic macro lens from Photojojo is only $20, it also leaves a lot to be desired. Now appsman over at Instructables.com has designed a slide-on macro lens holder that can be had for about $15.
