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Mmm... aperture comes into play too though. If the seeing is bad IMHO theres something to be said for putting an aperture stop in front of the scope that reduces the aperture - half or 30% on bright objects. Though I guess they wouldn't stop the 150" down to 20cm.
My little 70mm refractor happily shows a steady airy disk at 150X in quite strong winds and what would normally be considered appalling seeing. That's less than 2" though not by much.
Last edited by Wavytone; 21-10-2016 at 09:10 PM.
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