---
title: systemRecommendedExposureBiasRange
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avcapturedevice/format/systemrecommendedexposurebiasrange
---

# systemRecommendedExposureBiasRange

The system’s recommended exposure bias range for this device format.

## Declaration

```swift
@nonobjc var systemRecommendedExposureBiasRange: ClosedRange<Float>? { get }
```

## Discussion

Discussion Use this value to create a slider in your app’s user interface that controls a device’s exposure bias within a system-recommended range. When a recommendation isn’t available, this property returns nil. note: The framework uses this value to define the range of an AVCaptureSystemExposureBiasSlider control.

## See Also

### Determining exposure support

- [minISO](avfoundation/avcapturedevice/format/miniso.md)
- [maxISO](avfoundation/avcapturedevice/format/maxiso.md)
- [minExposureDuration](avfoundation/avcapturedevice/format/minexposureduration.md)
- [maxExposureDuration](avfoundation/avcapturedevice/format/maxexposureduration.md)