ARRI ARRIFLEX D-21 - Manual (Page 18)

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Optical viewfinders are the preferred choice of both cinematographers and
camera operators. The clear, full color image enables accurate assessment of
focus and facilitates precise and comfortable operating for complex camera
moves. Most crucial of all is the fact that an optical viewfinder shows an image
larger than that being recorded and therefore allows the operator to see not just
what is in frame, but also what is just outside the frame. This safety area permits
meticulous composition and helps the operator prevent unwanted objects (such
as a boom mic) from entering a shot.
The Andromeda Strain;
Marty McNally, A Camera Operator (center)
with Jon Joffin, Cinematographer (right)
Photo: © A&E/Diyah Pera
The Company; Photo: Jan Thijs © Turner Broadcasting 2006
The Company; Photo: © Sony Pictures TV The Company; Photo: © Sony Pictures TV