You may eventually not need to lugging around a pricey DSLR kit anymore, because the Olloclip lens can be clipped to your iPhone 4′s camera. The built-in lens with a three-in-one optic that clips onto the phone and can be stored in your bag or pocket when not in use.
The Olloclip lens is designed by a pair of startup companies in California. Customers can now order the lens, and it will arrive in two months later. The Olloclip lens provides the performance of all three lenses to the iPhone 4.
The Olloclip lens is not cheap as an iPhone accessories, which is priced at $70 a piece. Though is still a bargain compared a professional DSLR lens. Also, there are design limitations, which mean it is not interchangeable with other devices.
Source: olloclip