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# systemRecommendedVideoZoomRange

The system’s recommended zoom range for this device format.

```
@property (nonatomic, readonly, nullable) AVZoomRange * systemRecommendedVideoZoomRange;
```

## Discussion

Use this value to create a slider in your app’s user interface that controls a device’s zoom within a system-recommended range. When a recommendation isn’t available, this property returns `nil`.

Apps can key-value observe a capture device’s [`minAvailableVideoZoomFactor`](/documentation/AVFoundation/AVCaptureDevice/minAvailableVideoZoomFactor) and [`maxAvailableVideoZoomFactor`](/documentation/AVFoundation/AVCaptureDevice/maxAvailableVideoZoomFactor) property values to know when a device limits its supported zoom to the recommended range.

> Note:
> The framework uses this value to define the range of an ``doc://com.apple.avfoundation/documentation/AVFoundation/AVCaptureSystemZoomSlider`` control.

---

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