Movie Button - Sony ILCA-77M2 Use Instructions

subject is dark.
1. MENU →
Menu item details
On (default setting):
Uses [ Auto Slow Shut.]. 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 Shut.]. 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:
When [Movie] in shooting mode is set to [Shutter Priority] or [Manual Exposure].
When [ISO] is set to other than [ISO AUTO].
[132] How to Use

MOVIE Button

Sets whether or not to activate the MOVIE button.
1. MENU →
Menu item details
Always (default setting):
Starts movie recording when you press the MOVIE button in any mode.
Movie Mode Only:
Starts movie recording when you press the MOVIE button only if the shooting mode is set to
[Movie] mode.
[133] How to Use
convenient use
Memory
(Camera Settings) → [
Using shooting functions
(Custom Settings) → [MOVIE Button] → desired setting.
Using shooting functions
Auto Slow Shut.] → desired setting.
Recording movies
Customizing the shooting functions for