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If you want a zoom eyepiece then you need zooms with click-stops, which is only a Baader Hyperion Zoom Mk IV from what I know. If they are not click-stops then you would have lots of issues with selecting exactly the same focal lengths on both zooms and as a result bad views.
When selecting eyepieces for binoviewing they should be not only the same focal lengths, bit the same model. And preferably from the same batch. So try to buy a pair. Celestron Omni plossls are a very good start.
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