Personal Functions enable you to further customize your camera settings. They are set with EOS LINK SOFTWARE ES-E1 (sold separately) which connects the EOS-1V to a personal computer P.Fn-0 (Custom Function group registration) can be set with the EOS-1V body as well
You can interchange the camera's focusing screen to suit the picture-taking application. You must also set C.Fn-0 so that the criteria for the correct exposure suits the focusing screen
Mirror lockup is enabled with C.Fn-12. This prevents mirror-caused vibrations which may blur the image during close-ups or when a super telephoto lens is used. When mirror lockup is set, the camera operates as follows.