Sony Cyber-shot DSC-HX99 Help Manual page 377

Help Guide
Digital Still Camera
DSC-HX99
Auto Slow Shut. (movie)
Sets whether or not to adjust the shutter speed automatically when recording movies if the subject is dark.
MENU → (Camera Settings2) → [ Auto Slow Shut.] → desired setting.
1
Menu item details
On:
Uses Auto Slow Shutter. The shutter speed automatically slows when recording in dark locations. You can reduce noise
in the movie by using a slow shutter speed when recording in dark locations.
Off:
Does not use Auto Slow Shutter. The recorded movie will be darker than when [On] is selected, but you can record
movies with smoother motion and less object blur.
Note
[ Auto Slow Shut.] does not function in the following situations:
(Shutter Priority)
(Manual Exposure)
When [ISO] is set to other than [ISO AUTO]
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