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A Nagler 3-6mm Zoom eyepiece (or 6-3mm as Tele Vue now call it) works very well with my ED80 and will work well on any ED or APO of around 600mm focal length. You get 100x to 200x magnification with the ED80 with click stops at 1mm increments and variable magnification in between. Focus and apparent field remain unchanged when zooming.
Yes it costs as much as the telescope but it may just be what the OP wants. If you can get one used even better but join the queue. I personally think at $489.00 (current price) it's an absolute bargain for what is in essence multiple eyepieces.
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