#EXIF

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EXIF stands for EXchangeable Image Format. It is metadata that is written by cameras at the time of exposure and can be amended or deleted by editing software. It contains vital information that describes how an image was made including camera, lens, ISO, shutter speed, aperture, time of capture - basically everything that amounts to the image. When software like Lightroom adds to it, so much detail is contained in the EXIF that using the right EXIF viewer you can even determine what presets a photographer used, or what exact adjustments have been made.