Olloclip produce a snap on/off 3-in-1 lens solution for the iPhone 4/4S and now the iPhone 5. I bought one for my iPhone 5 and really have been very impressed by this little accessory. The results can be really artistic and fun, and incredible too. Basically you place on the camera corner of the iPhone 5. One side does the fisheye, switching over does wide angled. Unscrewing the wide angled lens reveals the macro lens. So below is a normal shot from the iPhone 5 camera.
And now the same shot with the fisheye lens.
You can also use the Olloclip for video. The Olloclip only works on a naked iPhone 5, so make sure when you attach the lens there is no dirt on your phone or inside the slot of the Olloclip.
I really love this attachment.