Apparently not everybody is pleased with the lens on the, even the 5-megapixel lens on iPhone 4. So a detachable lens as a complement is very necessary such as the Zeiss fisheye, macro and es.
For different purposes, this set ofes consists of one and one combo macro/wide angle lens. Each Zeiss lens comes with a detachable magnetic ring that allows you to fix the portable lens on the . The wide angle lens features 0.67x angle and 10-23mm focusing distance, and the fisheye lens features 180 degree angle.
The set of portable Zeiss lenses is priced at $40 USD. Of course, you also can purchase one of them separately. If you want one, jump to Photojojo for more details.