<p>This was in a bunch of 8x10 Deardorff stuff. Looking for a name or accurate description of what it is called. One knob opens and closes the aperture, the other one locks it.<br>
Thanks<br>
<img src="http://i.imgur.com/dy2FyMom.jpg" alt="" width="240" height="320" /><img src="http://i.imgur.com/i1z0vsqm.jpg" alt="" width="320" height="240" /><br>
<img src="http://i.imgur.com/qRhcRyVm.jpg" alt="" width="240" height="320" /></p>