Are you a bird watching (I am talking about the winged-kind) then here is an optical device, just made for this hobby.  

The new Military Zoom binoculars are one of the most advanced set of field glasses ever produced. With these, anyone can literally, see the whites of a bird’s eye, some 500 yards away.  

You can also view certain planetary bodies, which will appear a wee bit closer than if you would see them with your naked eye.  

This wonderful set of viewing glasses comes with a hefty price tag of US $ 200.