Sometimes, but not always. Camera body serial number is often stored in image metadata, while lens serial number depends on both the camera and the lens. Many combinations—especially older Canon bodies/lenses—either don’t record lens serial numbers at all or write unusable values such as zeros.

Lightroom may not show all available metadata tags, so absence in Lightroom does not necessarily mean the data is missing from the file. A better tool for checking is ExifTool, which can read many tags GUI apps omit.

Useful commands include:

• exiftool -a -G image.jpg to show all metadata
• exiftool -a -SerialNumber image.jpg for camera serial
• exiftool -a -InternalSerialNumber image.jpg for camera internal serial
• exiftool -a -LensSerialNumber image.jpg for lens serial

If ExifTool does not show a valid lens serial number, your camera/lens combination likely does not record it, and the only reliable source is the serial number printed on the lens itself. For documenting gear for theft/loss purposes, it’s best to physically record the serial numbers from the equipment in addition to checking metadata.