Sony A7RIII ILCE-7RM3A Operating Instructions Manual page 291

Help Guide
Interchangeable Lens Digital Camera
ILCE-7RM3A
α7RIII
Release w/o Card
Sets whether the shutter can be released when no memory card has been inserted.
MENU → (Camera Settings2) → [Release w/o Card] → desired setting.
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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.
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