After changing a lens, set the parrallax correcting dial (10) to the focal length value of the mounted lens. For 55mm and 65mm lenses, set the parallax correcting dial to 80, then attach the parallax correction plate for 55mm/65mm lenses to the focusing hood. (Refer to p.22). For the 250mm lens, set the parallax correcting dial to 180.

2 For the cocking lever on the 180mm lens, an auxiliary lever for connection is provided on the side of the lens barrel. Since this lever is constantly pushed upward by a spring, when mounting the lens, hold the auxiliary lever downward with a finger tip to prevent obstructing installation.

3 When the lens lock knob (11) is in the UNLOCK position, the portion to which the picture taking lens (lower lens) is attached is protected from the camera interior by a cover to shield the film from exposure to light and a red warning signal is visible on the focusing screen surface.
Should this cover be pushed while removing the lens, light will strike the film. Don't push it.

4 After changing a lens, turn the lens lock knob (11) to the LOCK position, otherwise, the shutter release button cannot be depressed.