For years photographers have used a loupe to check focus on the groundglass of a view camera, or to inspect a negative or slide. A loupe is simply a magnifier for very close viewing. With the advent of digital cameras, a loupe takes on a new role. It’s pretty hard to resist chimping your images while shooting; but out in the bright sun it’s almost impossible to see the image on your LCD screen. A loupe can help by blocking out the light while checking your screen.
This post will give you step-by-step instructions for building your own loupe. The parts will cost you less than $15 and it takes a little less than an hour to make.