Canon EF-D Focusing Screen for Canon EOS 40D Digital SLR Camera The Canon Ef-D Focusing Screen is a precision matte surface with etched grid lines to assist composition. The camera's AF points remain fully visible. Focus characteristics are suited to most lenses. Compatibility: EOS 40D, EOS 40D Refurbished (Body), EOS 40D with EF 28-135IS Refurbished, EOS 50D (Body), EOS 50D Body Refurbished, EOS 50D EF 28-135mm IS Lens Kit, EOS 50D EF 28-135mm IS Lens Kit Refurbished, EOS 60