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These are standard 1.25-inch barrel eyepieces and will work in any sort of binocular-type instrument - binoviewer, binocular telescope or big binoculars. The 3-D effect will be seen in any of these instruments. Swap out the fancy 3-D eyepiece and insert the "neutral" eyepiece and you just have a matched pair of very nice 21mm 65-degree apparent field eyepieces.
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