title: Ways to set exposure on webcams reliably?
body: <p>I'm working on a project where I use a webcam to continuously take pictures at varying exposure values (to make a stream of HDR images). I've been using a Logitech C310 camera and I've been setting the exposure value by sending the following to the command line:</p>
  
  <pre><code>"v4l2-ctl --set-ctrl=exposure_absolute=%d --device=/dev/video1",exposureValue
  </code></pre>
  
  <p>This works pretty well when I set it to one exposure for a long time, then another, but when I try taking 3 frames in a row, the exposure doesn't change by much for each frame.</p>
  
  <p>The other issue with my camera is that at its maximum exposure value of 10000 (whatever units this is I don't know), the frames aren't as exposed as I'd like them to be.</p>
  
  <p>1) Is there some fundamental issue with constantly changing the exposure value that would stop it from working consistently on most webcams?</p>
  
  <p>2) Are there webcams that anyone could recommend that are better suited for taking high-exposure shots?</p>