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Old 22-11-2013, 09:23 PM
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Peter Ward
Galaxy hitchhiking guide

Peter Ward is offline
Join Date: Dec 2007
Location: The Shire
Posts: 7,105
Originally Posted by Bassnut View Post
So what does that prove??, seeing doesnt matter that much??. You took this single non-deconed sub in Sydney skies right?. So, seeing can be beat with good gear/set up and AO. Thank you, so seeing isnt the limiting factor, obviously

I look at it this way....if an optical system is, to coin an old chestnut, is barely "diffraction limited" then *even the slightest* seeing distortion, by definition makes the images it produces, poorer than that limit.

If on the other hand, the optical system is better than "diffraction limited"
(yes... this is possible) it can suck up, for example, a 1/6th wave of atmospheric distortion before *total aberrations* take it into the 1/4 wave "diffraction limit"

Hope that makes sense
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