Make your own macro lens adapter for the iPhone 5. I designed the original version of this for my iPhone 4 (see "iPhone 4 Macro Lens" on Shapeways) when I couldn't find the close-up image quality I wanted for less than $60. This is far cheaper than anything commercially sold and, in my opinion, has better image quality.
Print this model and then buy a glass lens for $4 from Surplus Shed (http://www.surplusshed.com/). Their part number is L4471. For some reason the search function on the Surplus Shed site won't search part numbers. To find L4471, use the "Lens Finder" on their home page. In "Lens Finder" type:
Lens Type: PCX, Plano Convex
Diameter: 12mm to 12mm
Focal length: 51mm to 51mm
That will get you to L4471
The lens fits in a recess in the Shapeways model and is held in place with a few tiny drops of Superglue. If you get any glue on the lens it can be cleaned off with nail polish remover or acetone. The lens is plano-convex (one side is flat). When inserted in the model, the flat side of the lens should face the phone.
Note that the lens fits pretty snugly into the opening. Try fitting the lens before applying any glue. Before gluing, with the lens holder laying face-down on a table, lay the lens in position, and then push it into the recess by pushing the lens with the eraser-end of a pencil. Again, do this first WITHOUT glue. Once you know the lens fits cleanly, push it back out and put two tiny drops of superglue on opposite edges of the opening. I use a toothpick to apply the glue because squeezing the superglue directly out of the tube risks putting on too much. Only *tiny* drops are necessary. Then push the lens back in the same way as in the test fit.
The example photos of the watch and microchip have not been cropped or altered in any way. Those 4 shots were loaded straight from the iPhone 5 (though Shapeways compresses them). It appears that although Apple improved many aspects of the camera on the iPhone 5, focus range did not get closer, so this lens helps just as much for macro shots as it's brother did for the iPhone 4/4S .
PLEASE NOTE: This model will not slide over iPhone 5 cases. It fits only on an uncovered iPhone 5.