So it’s like 1.2x digital zoom from a 48MP shot + 1.2x digital zoom from quad-binning to get 12MP shot and processed them to output a 1.2x 24MP shot?
Not sure how they do but here are my tests...
Camera Settings, Photo Mode set to 24MP...
Not shooting in RAW modes.
When pressing the 1x button to toggle between the three zooms, all produce 24MP pictures using Main Camera.
1x (24mm) shot is 24MP
1.2 (28mm) shot is 24MP
1.5 (35mm) is 24MP
Apple is able to reconstruct a 24MP image from the 48MP sensor up to 1.5x
Pressing 2x button only produces 12MP pictures off the Main Camera.
2x (48mm) is 12MP
Zoom up to 5x on main camera produces 12MP pictures.
Sometimes 5x zoom or greater in camera app will actually still use the main camera instead of 120mm depending on distance to object, light levels, etc.
Of course, .5 and 5x use the different ultra wide and telephoto cameras respectively, which only produce 12MB pictures.