For photographing "round-the-corner" and for taking pictures unnoticed. That's because the picture being taken is 90° away from where the camera is pointed. Terrific for taking candid photographs, especially natural shots of children who are usually camera shy. They won't even know that they are being photographed. Threads into front of your 58mm lens or video camera. Also avialable in 52mm size..
The Adorama Mirror Scope Spyscope is most used by customers who consider themselves to be a Enthusiast among others.