title: Getting exposure values from camera on iPhone OS 4.0
body: <p>Exposure values from camera can be acquired when you take picture (without saving it to SavedPhotos). A <a href="http://www.ambertation.de/en/lightmeter/" rel="nofollow noreferrer">light meter</a> application on iPhone does this, probably by using some private API. </p>
  
  <p>That application does it on iPhone 3GS only, so I guess it may be somehow related to EXIF data which is populated with this information when the image is created.</p>
  
  <p>This all applies to 3GS. </p>
  
  <p>Has anything changed with iPhone OS 4.0?
  Is there a regular way to get these values now?</p>
  
  <p>Does anyone have a working code example for taking these camera/photo setting values?</p>
  
  <p>Thank you</p>