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Several companies make bino viewers. They aren't cheap. Then you need two identically matched eyepieces. Either two barlows or one with a very long throw that goes before the binoviewer. Some have barlow's made for their system. With a newtonian you'll likely have to move the mirror closer to the secondary to accomodate the needed back focus. They work best on SCT and refractors with long back focus.
A much cheaper solution is an eye patch. I use one over the observing eye when I am looking at star charts and then flip it to the chart eye when at the telescope. This preserves the dark adaption of one eye leaving the other to look at the glare of the chart light set so low you can barely read the charts. Rick |
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There are reviews of a number of binoviewers posted here.
I own a Denkmeier binoviewer. The Denkmeiers are probably the best binoviewers on the market and allow the use of binoviewing at lower magnifications, something that cheaper units unfortunately do not. The Denkmeiers have an OCS (optical corrector system) lens system for use with Newtonians. Most binoviewers are going to cause balance problems with small Dobsonians, however. Dave Mitsky
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