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I agree with the 20mm Televue plossl. I picked up one second hand and it's a great plossl. Watch the secondhand market, they come up often - put a wanted ad in.
I often get down to my 10mm Vixen LV in the 3x Televue barlow in the 12" f5 - on Moon and planets. That's 450x if my calculation is correct. If seeing is acceptable, it's fine.
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