Hello, I just got an EOS 3 today. Nice camera. I want to get the Ec-S screen for it. I notice that it is not listed as being for the EOS 3, however. 1. Will it install into the EOS 3? 2. If it installs, will it auto focus? 3. Can the camera be set to have an accurate meter with this screen? (I normally abhor in-camera meters, but will likely want to use the spot pattern from time to time.) Thank you in advance.