title: Does ExifInterface.TAG_SHUTTER_SPEED_VALUE really measure shutter speed? If so, how to convert it to a more standard format?
body: <p>I'm trying to get camera shutter speed when a photo is taken with Android camera. Using this instruction in an image the app creates that contains the taken photo.</p>
  <p>double vel = exif.getAttributeDouble(ExifInterface.TAG_SHUTTER_SPEED_VALUE, 0);</p>
  <p>This gives some values that change according to the level of luminosity, for example right now if I allow natural light to go through my window fully it offers the value 6.906 and if I don't allow it as much as possible it is 3.882.</p>
  <p>But on the other hand I'm using <a href="https://play.google.com/store/apps/details?id=com.footej.camera2&amp;hl=en_US&amp;gl=US" rel="nofollow noreferrer">this app</a> to check correctness of the values and for these same cases it offers the values 1/120 and 1/12, which seem to be on a standard format to represent shutter speed as seen <a href="https://wp-modula.com/shutter-speed-photography/#:%7E:text=Common%20shutter%20speed%20values%20The%20common%20shutter%20speeds,faster%20shutter%20speed%20than%201%2F8th%20of%20a%20second." rel="nofollow noreferrer">here</a>.</p>
  <p>I can't grasp if ExifInterface.TAG_SHUTTER_SPEED_VALUE is measuring shutter speed correctly, but in other scale which I don't know how to convert or if it's doing that in a wrong way and using it wouldn't help.</p>
  <p>Could anyone tell me how to convert to the 1/x format from the value it gives or tell me if it's measuring any other thing?</p>