ARRI ARRIFLEX D-21 - Manual (Page 8)

8
An optical viewfinder is 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 through a complete lack of any delay. 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 or microphone)
from entering a shot.
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