The Canon EC-CIV Focusing Screen laser matte achieves easier focusing and good background blur. It is brighter, less grainy and better balanced.
The Ee-A standard screen maximizes viewfinder brightness and is optimized for use with f/5.6 EF lenses and slower.
The Canon Eg-D Precision Matte Focusing Screen with Grid is an interchangeable focusing screen compatible with the Canon EOS 5D-Mark II camera. This grid screen provides a 3-line (horizontal) by 5-line (vertical) etched grid which facilitates easier composition...
This is an optional focusing screen that combines the focus area brackets with a grid to ensure proper composition.
Replacement focusing screen for various PENTAX interchangeable lens cameras.