Instance Property

exposureDuration

The length of time over which exposure takes place.

Declaration

@property(nonatomic, readonly) CMTime exposureDuration;

Discussion

Only exposure duration values between minExposureDuration and maxExposureDuration are supported.

The exposure duration can be read at any time, regardless of exposure mode, but can only be set by the setExposureModeCustomWithDuration:ISO:completionHandler: method.

You can observe changes to the value of this property using Key-value observing.

See Also

Managing Image Exposure

- setExposureModeCustomWithDuration:ISO:completionHandler:

Locks the exposure duration and ISO at the specified values.

exposureTargetOffset

The metered exposure level's offset from the target exposure value, in EV units.

exposureTargetBias

Bias applied to the target exposure value, in EV units.

minExposureTargetBias

The minimum supported exposure bias, in EV units.

maxExposureTargetBias

The maximum supported exposure bias, in EV units.

activeMaxExposureDuration

The maximum exposure duration, in seconds, defined in the auto-exposure algorithm.

- setExposureTargetBias:completionHandler:

Sets the bias to be applied to the target exposure value.

AVCaptureExposureTargetBiasCurrent

A special constant representing the current exposure bias value.

AVCaptureExposureDurationCurrent

A special constant representing the current exposure duration setting.