If the stop-down lever of the camera is locked in before you mount the lens. If you exposure a frame in this situation, it will be incorrectly exposed due to incorrect coupling of the aperture ring.
A slight error in the projection angle can be corrected using the [KEYSTONE] button ... Ceiling Mounting or Rear Projection You can mount the projector on the ceiling (Ceiling mounted ) with it turned up side down or place it behind the screen (Rear) if you use a translucent screen. If you mount the projector on the ceiling, you have to invert the projected image
