The maximum exposure duration, in seconds, defined in the auto-exposure algorithm.
- iOS 12.0+
When you set a new session preset on your capture session or select a different
active on your capture device, you can query or observe changes to
You can override this property at any time, to any value in the
max range. Changes are reflected immediately while the session is running, with no graph rebuilding. You can also set the property to
invalid to return to the default value. For example, one case in which you'd override the auto-exposure algorithm's maximum exposure duration is if you want shorter exposure than your frame rate. If you need to freeze motion by exposing for 1/40th of a second but still capture 30 frames a second, then a manual override is needed.