Cambo CS-31

HDSLR Viewing Loupe 3.2 Screen (D800 series / 5D Mk3)
Cambo's latest CS-31 Viewer for HDSLR cameras features a 3x magnification loupe, made with Schneider Kreuznach optics, offering adjustable dioptrie setting for best viewing comfort. 
The CS-31 Viewing loupe set includes a bracket for mounting the holding frame underneath the DSLR camera.

The CS-31/32/33/34 versions include an adjustable bracket for mounting the viewing hood to the tripod mount of the SLR camera, avoiding having to glue a frame to the back of the camera.

CS-31 is designed for HDSLR cameras with 3.2" screen like the Canon 5D Mk3, and Nikon D800.