This 6x zoom lens by Conice is available for each iPhone model. It comes with a transparent case and a strap. You can easily take zoomed pictures by attaching the lens to the iPhone case.
Wide Angle/Marco, Fisheye Camera Lenses For iPhone & iPod Touch
Gadgets lovers will love these camera lenses which can be easily attached to your iPhone or the new iPod Touch camera! The combo wide angle/macro lens can capture wide angle shots, or can be set as a macro for close-up shots. The fisheye lens creates curve edges with 180 degree angle. The lens attaches to the iPhone or iPod Touch via magnetic ring.