Sony ILCE-7C Help Manual page 490

Help Guide
Interchangeable Lens Digital Camera
ILCE-7C
α7C
Auto Slow Shutter (movie)
Sets whether or not to adjust the shutter speed automatically when recording movies if the subject is dark.
MENU → (Camera Settings2) → [
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 Shutter] does not function in the following situations:
During slow-motion/quick-motion shooting
(Shutter Priority)
(Manual Exposure)
When [ISO] is set to other than [ISO AUTO]
Auto Slow Shutter] → desired setting.
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