EXIF tag · ExifIFD

FocalLength

The actual focal length of the lens in millimetres.

0x920a
Tag ID (37386 decimal)
ExifIFD
IFD / group
rational64u
Data type
EXIF
Table

What FocalLength means#

The actual focal length of the lens in millimetres.

Read, write and remove it#

# read
exiftool -FocalLength photo.jpg
# write
exiftool -FocalLength="…" photo.jpg
# remove
exiftool -FocalLength= photo.jpg
# all files in a folder, as CSV
exiftool -csv -FocalLength -r ./photos > focal-length.csv

In Python with Pillow:

from PIL import Image
exif = Image.open("photo.jpg").getexif()
value = exif.get_ifd(0x8769).get(0x920a)  # FocalLength
print(value)

Other ExifIFD tags#

Frequently asked questions#

What is the EXIF tag ID of FocalLength?

0x920a (37386 decimal), in the ExifIFD directory.

How do I see FocalLength in a photo?

Run exiftool -FocalLength photo.jpg, or open the file's info panel in Lightroom, Photoshop, Windows (Properties → Details) or macOS Preview (Tools → Show Inspector).

Last updated October 03, 2026 · How we calculate · Sources

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