Improve your view and composition with an alternative Canon focusing screen to the one fitted to your camera as standard (Type A).
Type S is a super precision matte screen, suitable for manual focusing with fast lenses and particularly useful for close-up and macro work. It makes slightly out of focus areas appear more out of focus so you can concentrate on your subject.
EG-S fits the EOS 5D Mark II camera.
Focusing screens are delicate and shouldn't come into contact with your skin, so each one is supplied with a special tool for fitting.