The following fields are on the Camera Properties dialog box:
A descriptive name for your camera (this will appear within the Advance Camera Tools submenus in SketchUp).
The physical height of the camera above ground.
The forward or backward tilt of the camera, similar to a person tilting their head.
The left or right swivel of the camera in degrees, similar to a person turning their head.
The zoom value of the camera.
The width and height of the film or sensor as a decimal number. The numbers 1.33 and 2.4 are common aspect ratios for film.
The physical width of the film or sensor for your new camera, in millimeters. Usually you will need to look this up this figure in your camera's manual.