The Canon Eh-S Focusing Screen for EOS 7D Mark II DSLR Camera 9136B001 is specially designed to create sharp points of focus. The fine micro lens structure provides high performance and makes it ideal for focusing in dim light with fast lenses. This focusing screen is specially made for wide-aperture lenses that are in the f/1.8 - 2.8 range. It is compatible with EOS autofocus systems. This is a replacement screen for the standard screen installed already. Since it is very delicate, care should be taken while handling this focusing screen.