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<p>[QUOTE=&quot;springfld.arsenal, post: 113501, member: 54&quot;]More details on how it works:&nbsp; The optical port inside the filter-selecting wheel looks straight out the side of the device.&nbsp; The port on the opposite side looks straight out of that side.&nbsp; The large eyepiece views a split or superimposed image, what one port sees overlayed on what other one sees.&nbsp;&nbsp; The small black knob moves one image laterally over the other, I think the moveable image is from the port inside the filter wheel (let&#039;s call it port &quot;f.&quot;)&nbsp; The other port we&#039;ll call &quot;o.&quot;&nbsp; So you can set the darkest filter, point port f at the sun. and see a white ball no brighter than an incandescent lightbulb superimposed on view out of port o.&nbsp; When you look in the small eyepiece, the black cursor line lines up on the -2 to +2 degree scale to show what I think is the angle between the sun (or whatever) in f and, for example, the horizon you see in o.[/QUOTE]</p><p><br /></p>

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