HoodEyetm links eye to camera for improved viewfinder optics. Easily upgrade your camera eyepiece in seconds. Five HoodEYE models fit all Canon and Nikon Digital SLR cameras. Unique self locking mount system keeps HoodEYE eyecup securely in place. The HoodEYE eyecup rotates to accommodate both right and left eyed shooters. Figuring out what model you need is easy..

Rotates to accomodate right and left shooters

Nikon has SQUARE eyepieces or ROUND eyepieces.
Canon has one 22mm eyepiece for the 1DS MARK III
Canon also has 18mm eyepieces for most Canon SLR Model excluding 5D & 5D Mark II Models.
Model H-EYEC18L for Canon 5D & 5D Mark II Models ONLY.