It's just an exif viewer.... Doesn't control the camera.
Sometimes when I see good pics I really wanna know the settings used so it's good for that (unfortunately Some websites like Facebook remove exif info though )
just downloaded it. I transfer a lot of my nikon photos to the phone so it is nice that it gives me info on the photo like the date shot so I can go back to the computer and find it. Also tells me what camera I used.
Yes.... It tells about the camera & lens & aperture & ISO & speed on other's pics also
Sometimes when I see a pic online I have to have that info (if exif is not removed by that website hopefully)