Solution
The focusing screens for the EOS cameras are as follows. For the details about how to replace the focusing screen, see the instruction manual for the focusing screen.
Ec series:
Ec-CV(pre-installed)/
Ec-A/Ec-B/Ec-D/Ec-H/Ec-I/Ec-L/
Ec-C*/Ec-C II*/Ec-C III*/Ec-C IV*/Ec-N*/Ec-R*/Ec-S*
*: The focusing screen can be attached to the camera, but appropriate exposure cannot be obtained. Use a commercially-available light meter to set a manual exposure or set exposure compensation and shoot.
NOTE
After replacing the focusing screen, you need to change the custom function setting depending on the focusing screen type in order to be able to shoot with the optimal exposure. For the details about how to change the setting, see the instruction manual of your camera.