Aaton Camera body 27Adjusting the diopterBefore shooting, the diopter setting of the viewfinder should be adjusted tothe Operator’s eye. To set the diopter, use the diopter set ring (E) located onthe short eyepiece.Look through the viewfinder while rotating the diopter set ring until the edgeof the viewing screen cross-hair is in sharp focus. It is recommended to per-forme this adjustment with the port cover off and no lens on the camera.NOTE: the diopter set ring is engraved with numbers and dots. Use them toquickly recall your particular setting when more than one person is lookingthrough the viewfinder.The eyepiece shutterTo prevent light from lleaking through the viewfinder, the eyepiece shuttermust be closed any time the camera is running film and the Operator’s eye isaway from the eyepiece.To close or open the eyepiece shutter, use the small silver lever located onthe eyecup ring (F).Viewing screenThe viewing screen (ground-glass) is interchangeable. Viewing screens for2-Perf and 3-Perf formats can be selected in «Viewing Screens List», Chap-ter 5.FE