Canon EOS 1 Instructions Manual page 13

Lens Information
For automatic focusing, slide the lens' focus
mode switch to "AF" . Set to "M" for manual
operation.
-To
remove the lens, press the lens release but-
ton and turn counterclockwise.
- The electronic contacts must be clean for
proper contact.
Do
not touch these contacts.
- Do not set the lens on its rear end without
the lens cap attached to prevent damage
to the electronic contacts.
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