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# nominalFocalLengthIn35mmFilm

The nominal 35mm equivalent focal length of the capture device’s lens.

```
var nominalFocalLengthIn35mmFilm: Float { get }
```

## Discussion

This value represents a nominal measurement of the device’s field of view, expressed as a 35mm equivalent focal length, measured diagonally. The value is similar to the `FocalLengthIn35mmFormat` EXIF entry (see <doc://com.apple.documentation/documentation/ImageIO/kCGImagePropertyExifFocalLenIn35mmFilm>) for a photo captured using the device’s format where [`isHighestPhotoQualitySupported`](/documentation/AVFoundation/AVCaptureDevice/Format/isHighestPhotoQualitySupported) is `true` or when you’ve configured the session with the [`photo`](/documentation/AVFoundation/AVCaptureSession/Preset/photo) preset.

This property value is `0` for virtual devices and external cameras.

---

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