Sony HDVF-700A Operation Manual page 23

Removing the viewfinder
Note
Before detaching the viewfinder from the camera,
release the camera's panning lock lever and turn the
viewfinder in the direction 90º clockwise to the
camera's control panel. You cannot detach the
viewfinder from the camera unless it is in this position.
While pushing in the lock release tabs, grasp the
viewfinder handle and lift the viewfinder to remove it
from the camera.
Camera's control panel side
Lock release tabs
Panning lock lever
7(E)