iPad Telephoto Lens
This lens adds 10-12 times telephoto power to your iPad. It offers a 10X optical zoom when attached to an iPad 3 or iPad 4, and a 12X zoom when mounted on an iPad Mini.
This lens has a manual focusing ring to give you added control over its delightfully shallow depth of field. It also adds just a bit of vignetting and a dreamy lo-fi look. The price of the iPad telephoto lens is $25.
More details can be seen here.