Sony DSC-RX10M2 How To Use Manual page 157

Help Guide
Release w/o Card
Sets whether the shutter can be released when no memory card has been inserted.
1. MENU→
Menu item details
Enable:
Releases the shutter even if no memory card has been inserted.
Disable:
Does not release the shutter when no memory card has been inserted.
Note
When no memory card has been inserted, the images shot will not be saved.
The default setting is [Enable]. It is recommended that you select [Disable] prior to actual
shooting.
[156] How to Use
Shutter Type (still image)
You can set whether to shoot with a mechanical shutter or an electronic shutter.
1. MENU→
Menu item details
Auto:
The shutter type is automatically switched based on the shooting conditions and shutter
speed.
Mechanical Shut.:
Shoot with the mechanical shutter only.
Electronic Shut.:
Shoot with the electronic shutter only.
The availability of flash shooting, shutter speed, and with or without shutter sound for each
setting is as below.
Mechanical Shut.
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(Custom Settings) → [Release w/o Card] → desired setting.
Using shooting functions
(Custom Settings)→[
Setting the other functions of this product
Shutter Type]→desired setting.