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The camera shutter is interlinked, to operate the leaves in unison. To seal around a log, they would do better to be spring loaded individually. At this scale, weights could substitute for springs, where needed. A band clamp might be used to hold them all open.<div><br class="webkit-block-placeholder"></div><div>Bob Stuart</div><div><br><div><div>On 28-Jan-14, at 3:57 PM, Kevin wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><blockquote type="cite"><p style="margin: 0.0px 0.0px 0.0px 10.0px; font: 16.0px Helvetica; min-height: 19.0px"><br></p> <p style="margin: 0.0px 0.0px 0.0px 10.0px"><font face="Helvetica" size="5" style="font: 16.0px Helvetica">What did catch my eye, is the Iris opening device. I have never made anything</font></p> <p style="margin: 0.0px 0.0px 0.0px 10.0px"><font face="Helvetica" size="5" style="font: 16.0px Helvetica">like this, so does anyone have a reference site that I can study?</font></p> </blockquote><p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 16.0px Helvetica; min-height: 19.0px"><br></p> <p style="margin: 0.0px 0.0px 0.0px 0.0px"><font face="Helvetica" size="5" style="font: 16.0px Helvetica">I haven't seen any plans on how to build one, but for starters, if you had an old camera, ready for discard, you could take it apart carefully, to see the principles of operation.</font></p> </blockquote></div><br></div></body></html>