Panasonic SDR-H80A 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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