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Message: <blockquote data-quote="brocknroller" data-source="post: 1586290" data-attributes="member: 665">Spacepilot,Steve has youthful focus accommodation that belies his 91 years of age. He can "set and forget" on any bin. He didn't even need to reset the diopter on my first LX sample, which had a spinning wheel for a focuser. My focus accommodation changes from hour to hour and with light levels. I'm also one of those "birders who is too lazy to use glasses" (remember that infamous line?). Actually, I find it too uncomfortable to use glasses with bins, and most of my bins do not have enough ER for my glasses. Also, light tends to cause reflections on the EPs when I'm using glasses whereas without glasses, the eyecups block stray light from entering.Without my glasses, my astigmatism becomes more noticeable as light levels fall because my entrance pupils open wider, and that affects my ability to focus. I also find that the greater the DOF and the slower the focuser speed, the easier I am able to "snap to focus" and the less my need to reset the right diopter.  I don't know if you are a space pilot from the Mercury, Gemini, Apollo, Space Shuttle, or ISS generation, but if you've logged a lot of high altitude flight, you might want to get checked for cataracts. Cosmic rays during frequent air travel can cause them.  <a href="http://www.hindu.com/seta/2005/08/18/stories/2005081800341600.htm" target="_blank">http://www.hindu.com/seta/2005/08/18/stories/2005081800341600.htm</a>Space Cowboy (bet you weren't ready for that...)</blockquote>

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