Sony a7SIII Help Manual page 230

Help Guide
Interchangeable Lens Digital Camera
ILCE-7SM3
α7SIII
APS-C S35 (Super35mm) Shooting (still image/movie)
Sets whether to record in APS-C-equivalent size for still images and in Super 35mm-equivalent size for movies. If you
select [On] or [Auto], you can use an APS-C size dedicated lens on this product.
MENU → (Shooting) → [Image Quality] → [
1
Menu item details
On:
Records in either APS-C-equivalent size or Super 35mm-equivalent size.
When [On] is selected, the angle of view becomes approximately 1.5 times the focal length indicated on the lens.
Auto:
Automatically sets the capture range according to the lens.
Off:
Always captures 35mm full-frame image sensor pictures.
Note
When you attach an APS-C compatible lens and set [
results.
When recording 4K movies, [
Related Topic
Angle of view
Shooting] to [Off], you may not achieve the desired shooting
Shooting] becomes disabled and locked to [Off].
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Shooting] → desired setting.