F-Number (Aperture)
The lens aperture as an ƒ-stop. Smaller numbers mean a larger opening: more light and shallower depth of field.
- EXIF tag ID
- 0x829D
- Group
- Exposure
- Example
- ƒ/1.78 · ƒ/2.8 · ƒ/11
- Editable in EXIF Viewer
- Yes
What iPhone writes
Fixed per camera module (e.g. ƒ/1.78 main, ƒ/2.2 ultra-wide). Portrait mode's ƒ-number slider is simulated and stored separately.
What dedicated cameras write
The aperture actually used for the exposure.
How to view F-Number (Aperture) on iPhone
Open the photo in Photos, tap Share, then View EXIF (EXIF Viewer’s action extension). The field is listed under “Exposure”. Tap Edit to change it, or select several photos in the app to change them all at once. Or drop the photo into the free online EXIF viewer.
Related tags
- Aperture Value — The aperture in APEX units (2 × log2 of the ƒ-number). Redundant with F-Number.
- Max Aperture Value — The lens's widest aperture at the focal length used, in APEX units.
- Exposure Time (Shutter Speed) — How long the sensor was exposed, in seconds.
- ISO (Photographic Sensitivity) — The sensor's sensitivity setting. Higher ISO brightens the image at the cost of more noise.