The Ec series New Laser Matte Ec-N Interchangeable Focusing Screen from Canon
is for general photography and has a Bright Laser Matte field with an
AF ellipse center-focusing spot. It can be used in select Canon cameras,
and works with most lenses.
This focusing screen is the standard screen available with the Canon EOS
3 and can be used as the replacement screen if you scratch, damage or
break the original.