Equipment for binoscopes

With a binoviewer at a single scope, the brightness is halves, otherwise, the brightness is not double with a binoscope. But the visibility of faint structures especially at Deep Sky objects will be more than double as with only one scope. That mean in praxis, you will see with a 4" binoscope near as much as with a 8" singe scope (refractor) or a 12" dobsonian.

Background of this reason is, that no one is looking exactly parallel, anybody look's little bit squinting - just little bit only. Normally, our brain will this rectify to get a correct image of our environment. Only at some situations, one of your eye's will "switch of" unnoticeable to get a good image. Both issues imply loss of vision. As long you have enough light, is normally not so significant, but when observing a the limit of your eye's, you loss to much power of your scope.DeepSky observing is always observing at the limit

Only when both optical axis are adjusted exactly to your own eye's, you can catch the full power of your optics! If you see with only one eye just a undefined nebula, with both eye's you can distinguish suddenly many gray shades into the object even is still at same brightness. For example, with a 90 mm binoscope you can perceive the structure of the spiral galaxy M 51. Try to see this with a single scope of this size .... a big different.

Nothing is better than observing with both eye's

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