title: Olympus Camera Kit: Cannot update exposure compensation value soon after
body: <p>I have HDR app that takes three pictures with different exposure compensation settings, but I cannot change exposure compensation value shortly after shooting. Are there any restrictions on update timing of property?</p>
  
  <hr>
  
  <pre><code>for var i = 0 ; i &lt; 3 ; i++ {
      switch i {
          case 0:
                  camera.setCameraPropertyValue("EXPREV", value: "&lt;EXPREV/+2.0&gt;", error: nil)
          case 1:
                  camera.setCameraPropertyValue("EXPREV", value: "&lt;EXPREV/0.0&gt;", error: nil)
          case 2:
                  camera.setCameraPropertyValue("EXPREV", value: "&lt;EXPREV/-2.0&gt;", error: nil)
          default:
                  camera.setCameraPropertyValue("EXPREV", value: "&lt;EXPREV/0.0&gt;", error: nil)
      }
  
      camera.takePicture( nil, 
              progressHandler: nil, 
              completionHandler:{ info -&gt; Void in dispatch_semaphore_signal(semaphore)},              
              errorHandler: {error -&gt; Void in dispatch_semaphore_signal(semaphore)} )
  
      dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER)
  }
  </code></pre>