Orion/Celestron Bino Viewer

Hi group,

Both Orion and Celestron offer a Binocular Viewer for telescopes for
around $200. I know that use with a short-focal length refractor might
require the use of a shorty barlow because of required additional
inward focus, but my question is this, are these things too heavy
(about 18 oz) for a scope such as an ST80 or the like?

Thanks for an info,

Rick

.

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