[kan02134]

As @nanoanderson mentioned, we use the "FocalLengthIn35mmFormat" tag from EXIF. Let me explain why: since cameras have different sensor sizes, comparing actual focal lengths directly can be misleading (https://en.wikipedia.org/wiki/Crop_factor#Introduction). By using the 35mm film equivalent, we can compare field of views across all cameras on the same scale. For instance, a 50mm lens on a crop sensor camera shows a similar field of view to a 75mm lens on a full-frame camera.

We're using the 'exifr' library for EXIF data extraction: https://www.npmjs.com/package/exifr