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

# lensAperture

The size of the lens diaphragm.

## Declaration

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

## Discussion

Discussion The value of this property is a float indicating the size (the f number) of the lens diaphragm. This value doesn’t change.

## See Also

### Configuring exposure manually

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