Rear
Eye sensor
Screen is displayed on the viewfinder when an eye is brought close.
The eye sensor may not work properly depending on the shape of glasses in use, how you hold the camera, or the strong light hitting around the eye piece.
Lock lever
Secures the viewfinder in place.
Eye piece filter
Protective filter against dust, water, and moisture. Use the camera with this attached.
Stopper
Used when removing the viewfinder from the slider unit.