Panasonic SDR-H79P Operating Instructions Manual page 49

Auto slow shutter mode:
≥ When the auto slow shutter mode is selected,
the slowest shutter speed changes from 1/60
to 1/30.
≥ When the shutter speed becomes 1/30, the
screen display may be seen as if frames are
missed and afterimages may appear.
≥ If the scene is low in brightness or contrast, the
subject may not be focused on.
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