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Bino viewers are really only a gimmick. They may help some people with eye problems, particularly on bright object like the moon and planets but in general the action of splitting the light into two paths and the correctors needed to reach focus introduce reductions in light throughput equivalent to reducing your aperture by about 20%.
They do not produce a stereoscopic view as they are only looking at the image from one set of optics. However as already stated the view to be had from some of those 12.5" bino telescopes is magnificent.
Barry
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