The Canon Eg-S Super Precision Matte Focusing Screen is an interchangeable focusing screen compatible with the Canon EOS 5D-Mark II camera. The Super Precision Matte screen improves the ease of focusing when doing manual focus, but is not recommended for use with lenses slower than f/2.8. With these slower lenses, the viewfinder will actually look darker than with the standard Eg-A screen. Features Maximum screen size 7.62 cm (3") Compatibility EOS 5D Mark II Packaging content Quantity per pack 1 pc(s) Other features Product type Screen protector