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<p>[QUOTE=&quot;Vern, post: 31584, member: 347&quot;]The extension is for adjusting the light gathering.&nbsp; During full noon sun you&#039;d extend it to shield from the excessive light.&nbsp; In low light you&#039;d want to gather as much as possible.&nbsp; </p><p>Not for certain, but I bet if you test it in different conditions you&#039;d see this to be true.&nbsp; Awesome.&nbsp; Lots of these in Alaska belonged to ship captains.[/QUOTE]</p><p><br /></p>

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