About a year ago I made a clip-on lens for my iPhone and everyone is always asking me where I got it. It's very easy to make with just a few tools and materials. I'm not the first person to make one of these, but this is my take on it.
Step 1: Gather the Materials and Tools
Tools: pliers, small drill bits, X-Acto knife and/or saw, fine metal file and/or sandpaper, hair dryer or heat gun, tweezers, wire cutters
Materials: 4" of .04" music wire, disposable camera, 1/16" heat shrink tubing (4"+, 1 or more colors), super glue or RTV, O-ring assortment
The camera can be one that you have and have used up and removed the film, or you can ask for a used one from a one hour photo lab.
Step 2: Cover and Bend the Wire
Snip the wire to length (4"), if you haven't already before covering the wire with the heat shrink.
Using the pliers, shape the wire as shown in the photo. Each of the sides should be about 1/2". You will make a total of six 90 degree bends. Be careful about squeezing the wire too much with the pliers; they will damage the heat shrink around the tubing. Put a couple of layers of tape around the jaws of the pliers, if that helps.
Step 3: Add the Heat Shrink Banding
Slide the pieces onto the bent wire and use heat to shrink them in place. Don't try to do them all at once, they will slip out of place.
Step 4: Salvage the Lens
Pry open the clips. There should be two on either end of the camera.
Take out the lens and set it aside.
Cut the bezel off the front plate. The plastic will probably be thin and it should cut easily with a small X-Acto saw blade.
Step 6: Glue the Lens and O-ring
Apply a VERY small amount of glue and place the lens in the bezel with tweezers. Too much glue will create a haze on the lens and get all over the place. If you are at all worried about hazing the lens, use an industrial white glue or RTV. Allow time for it to cure before proceeding.
Find an o-ring that will fit into the back of the bezel and around the lens. This will help hold the lens in place when on the phone.
Glue the o-ring in place. Use super glue or RTV. RTV will take a couple hours to cure, at least.
Step 7: Finish Bending the Wire
Bend the wire as shown in the photo and clip. Leave about 1/8" after the bend.
Trim off a bit of the heat shrink and shrink a little band around the cut end.
Step 8: Prepare the Lens for Mounting on the Clip
Attach the bent wire clip to the bezel. That's basically it! Mount the lens to the phone for a final fit check.
Step 9: Use It!
You can see more on my blog, Sir Richard's Tool Kit.