If you scroll down a ways, on the right side it gives the info on the type of camera, focal length, shutter speed and aperture. This metadata is imbedded in all electronic photos, and DA reads and displays it.
Sometimes in post processing, it gets stripped away, or a photographer may choose to delete it. If you combine two or more photos, it's toss up which set of data gets displayed. Inn G.I.M.P., it's the first photo you open, ev3en if it is later cut down.