These are reasonably inexpensive binoviewers and an affordable way to see if this system works for you. Some people have trouble merging the two images and realize that binoviewing is not for them. This little unit will save you some cash.
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This model of binoviewer is one of the many clones available today. It has 3 nylon set screws for holding the eyepieces in place, and has diopter adjustment for both eyepieces. It has about 22 mm clear aperture at the front side with or without the