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# AVCaptureDeviceExposureSignal

Values that can be used to configure the auto exposure system via [`enabledExposureSignals`](/documentation/AVFoundation/AVCaptureDevice/enabledExposureSignals) and associated methods.

```
struct AVCaptureDeviceExposureSignal
```

## Topics

### Creating an exposure signal

[`init(rawValue: String)`](/documentation/AVFoundation/AVCaptureDeviceExposureSignal/init(rawValue:))

### Exposure signals

[`static let document: AVCaptureDeviceExposureSignal`](/documentation/AVFoundation/AVCaptureDeviceExposureSignal/document)

When enabled, auto exposure may close the aperture to improve sharpness of textual scenes.

[`static let flicker: AVCaptureDeviceExposureSignal`](/documentation/AVFoundation/AVCaptureDeviceExposureSignal/flicker)

When enabled, auto exposure may adjust the aperture to help exposure duration avoid synchronization with artificial lighting frequencies.

[`static let groupPhoto: AVCaptureDeviceExposureSignal`](/documentation/AVFoundation/AVCaptureDeviceExposureSignal/groupPhoto)

When enabled, auto exposure may close the aperture to increase depth of field when multiple faces are in the scene.

[`static let starburst: AVCaptureDeviceExposureSignal`](/documentation/AVFoundation/AVCaptureDeviceExposureSignal/starburst)

When enabled, auto exposure may open the aperture to remove diffraction artifacts from point light sources.

[`static let subjectMotion: AVCaptureDeviceExposureSignal`](/documentation/AVFoundation/AVCaptureDeviceExposureSignal/subjectMotion)

When enabled, auto exposure may close the aperture or decrease the exposure duration to reduce motion blur when there is a lot of motion in the scene.

## Relationships

### Conforms To

[`RawRepresentable`](/documentation/Swift/RawRepresentable)

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

[`Hashable`](/documentation/Swift/Hashable)

[`Sendable`](/documentation/Swift/Sendable)

[`Equatable`](/documentation/Swift/Equatable)

---

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