The attachment (which part protective case) costs $15 and doubles the weight of your iPhone.
Why not just carry a digital camera?
Cellphone cameras are for casual photos and the iPhone camera, while good, isn't high enough quality to merit such an attachment.
The "attachment" / case also has a standard "screw in" for a tripod.
It might be a little useful if Apple releases a video application.
Dimensions: 1.18 in x 1.18 in x 2.87 in
Weight: 4.69 oz