The Varavon LOUPE EX-SOLO DSLR Optical Viewfinder has four main parts: the loupe itself, the diopter handle, the main body, and the dial. Designed for the Canon T2i, this 3" viewfinder is large enough to cover your camera's screen. It features 3x magnification and no need for external power sources. You can choose to view the screen with the loupe, or you can open the viewfinder and utilize the hood. The aluminum dial, which mounts to the camera, fits into the camera's 1/4" tripod mount, securing the viewfinder. The durable hinge ensures the long life of the EX-SOLO, allowing the device to open up to 180° time and again. Other notable features include the sponge seal, which blocks unnecessary light and the diopter for adjusting the viewfinder to your eye.