Photographers love to accessorize their cameras, and the iPhone is no different. A case is one thing, but what about other photo-centric add-ons? Should you buy an extra-wide or telephoto lens that snaps in front of the built-in cameras? What about grips and shutter buttons that make the iPhone feel more like a traditional camera? We weigh in with our opinions and experiences with these types of embellishments. (And Jeff accidentally uses the B-word.)