SLR Mount from Photojojo for iPhone. The combination of the iPhone casing and lens mount support either Nikon or Canon EOS SLRs, which are also equipped with a UV filter. Aluminum casing has holes that allow the camera strap attached. There are two versions of the SLR Mount for iPhone, one for Nikon and one for the Canon EOS. SLR Mount for iPhone has priced $ 249 for the iPhone 4 and $ 190 for the iPhone 3.
You can buy into: http://photojojo.com/store/awesomeness/iphone-slr-mount/