1. Use an EXIF & Metadata Viewer
the Exif (Exchangeable image file format) data on a photo is the data about how the photo was taken. This includes the camera it was taken on, the histogram information, and most importantly, the photography trifecta shutter speed, ISO, and aperture/F-stop. To view the Exif data, you can download a plugin for your browser and use it to all the technical details of how the photo was taken.