---
title: iso
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avcapturedevice/iso
---

# iso

The current exposure ISO value.

## Declaration

```swift
var iso: Float { get }
```

## Discussion

Discussion This property controls the sensor’s sensitivity to light by applying a gain value to the signal. This value is between the active format’s minISO and maxISO values. Higher values result in noisier images. To set the ISO, call the setExposureModeCustom(duration:iso:completionHandler:) method. This property is key-value observable.

## See Also

### Configuring exposure manually

- [setExposureModeCustom(duration:iso:completionHandler:)](avfoundation/avcapturedevice/setexposuremodecustom(duration:iso:completionhandler:).md)
- [exposureDuration](avfoundation/avcapturedevice/exposureduration.md)
- [lensAperture](avfoundation/avcapturedevice/lensaperture.md)
- [activeMaxExposureDuration](avfoundation/avcapturedevice/activemaxexposureduration.md)