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# currentISO

A constant to indicate not to specify a new ISO value, and instead set it to its current value.

```
class let currentISO: Float
```

## Discussion

A special value that you may pass as the ISO parameter of the [`setExposureModeCustom(duration:iso:completionHandler:)`](/documentation/AVFoundation/AVCaptureDevice/setExposureModeCustom(duration:iso:completionHandler:)) method to indicate that the caller doesn’t specify a value for the ISO property, and to instead set to its current value.

> Note:
> A device may be adjusting ISO at the time of the call, in which case the value set may differ from the value of thee ``doc://com.apple.avfoundation/documentation/AVFoundation/AVCaptureDevice/iso`` property.

---

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