Straddling a fine line between really cool and a bit ridiculous (just like us) is the Binocular Adapter for iPhone 5 (and iPhone 4/4S with the included conversion kit) . This adapter case snaps onto your iPhone and allows you to hook it up to the eyepiece of most standard binoculars (not included). It may look slightly awkward (like us) but functionally it works (also like us).
Use your iPhone’s camera to capture long range pictures or video. Now I do suppose if you are going someplace and bringing binoculars anyway (say a sporting event) then you might as well have this case so you can snap a few pictures. Certainly easier than hauling around a DSLR with a huge lens. Of course you’re not getting DSLR quality pics but the iPhone can take decent shots.