---
title: quickTimeMetadataCameraLensIrisFNumber
framework: avfoundation
role: symbol
role_heading: Type Property
path: avfoundation/avmetadataidentifier/quicktimemetadatacameralensirisfnumber
---

# quickTimeMetadataCameraLensIrisFNumber

A value of type kCMMetadataBaseDataType_UTF8 indicating measure of the amount of light transmitted through the lens. It is the focal length divided by the effective lens aperture diameter (e.g. “F2.8” or “2.8”).

## Declaration

```swift
static let quickTimeMetadataCameraLensIrisFNumber: AVMetadataIdentifier
```

## Discussion

Discussion This is track-level metadata for video track that is associated with the camera.

## See Also

### QuickTime metadata identifiers

- [quickTimeMetadataAIMEData](avfoundation/avmetadataidentifier/quicktimemetadataaimedata.md)
- [quickTimeMetadataAccessibilityDescription](avfoundation/avmetadataidentifier/quicktimemetadataaccessibilitydescription.md)
- [quickTimeMetadataAlbum](avfoundation/avmetadataidentifier/quicktimemetadataalbum.md)
- [quickTimeMetadataArranger](avfoundation/avmetadataidentifier/quicktimemetadataarranger.md)
- [quickTimeMetadataArtist](avfoundation/avmetadataidentifier/quicktimemetadataartist.md)
- [quickTimeMetadataArtwork](avfoundation/avmetadataidentifier/quicktimemetadataartwork.md)
- [quickTimeMetadataAuthor](avfoundation/avmetadataidentifier/quicktimemetadataauthor.md)
- [quickTimeMetadataAutoLivePhoto](avfoundation/avmetadataidentifier/quicktimemetadataautolivephoto.md)
- [quickTimeMetadataCameraFocalLength35mmEquivalent](avfoundation/avmetadataidentifier/quicktimemetadatacamerafocallength35mmequivalent.md)
- [quickTimeMetadataCameraFrameReadoutTime](avfoundation/avmetadataidentifier/quicktimemetadatacameraframereadouttime.md)
- [quickTimeMetadataCameraISOSensitivity](avfoundation/avmetadataidentifier/quicktimemetadatacameraisosensitivity.md)
- [quickTimeMetadataCameraIdentifier](avfoundation/avmetadataidentifier/quicktimemetadatacameraidentifier.md)
- [quickTimeMetadataCameraLensModel](avfoundation/avmetadataidentifier/quicktimemetadatacameralensmodel.md)
- [quickTimeMetadataCameraShutterSpeedAngle](avfoundation/avmetadataidentifier/quicktimemetadatacamerashutterspeedangle.md)
- [quickTimeMetadataCameraShutterSpeedTime](avfoundation/avmetadataidentifier/quicktimemetadatacamerashutterspeedtime.md)