Sony ILCA-99M2 Manual page 260

When [ Aspect Ratio] is set to [3:2]
L: 18M 5168×3448 pixels
M: 11M 3984×2656 pixels
S: 4.5M 2592×1728 pixels
When [ Aspect Ratio] is set to [16:9]
L: 15M 5168×2912 pixels
M: 8.9M 3984×2240 pixels
S: 3.8M 2592×1456 pixels
Note
When [ Quality] is set to [RAW] or [RAW & JPEG], the image size for RAW images corresponds
to "L."
[267] List of MENU items
Aspect Ratio (still image)
MENU →
1
Menu item details
3:2:
Suitable for standard prints.
16:9:
For viewing on a high-definition TV.
[268] List of MENU items
APS-C/Super 35mm
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 →
1
Camera Settings1
(Camera Settings1) → [
Camera Settings1
(Camera Settings1) → [APS-C/Super 35mm] → desired setting.
Aspect Ratio] → desired setting.