Sony Alpha 7S II Quick Start Manual page 39

Camera Operations: Exposure
• In Program mode, shutter speed and aperture are set
automatically. You only have control over ISO. In Aperture
Priority, the shutter speed is set automatically as you adjust
aperture. Both Program and Aperture Priority are a problem for
video where you generally want to keep the shutter speed at
exactly twice the frame rate. If you are shooting at 30 fps, then
the shutter speed should be 1/60
shooting at 24 fps then the shutter speed should be 1/50
second (1/48
th
• If the shutter speed drops below twice the frame rate, motion
will be blurry. If it goes too far above this point, the motion can
have a "clockwork" appearance.
on a proper video camera).
of a second. If you are
th
of a
th