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I have to confess to owning a Saxon ED80, Orion ED80, Vixen ED80, Skywatcher ED80Pro and ED100Pro and cannot discern any optical differences whatsoever (except the extra light gathering of the ED100). Apart from the various colour schemes the Saxon has a slip on dew shield whereas the others screw on and the Vixen doesn't have holes drilled in the focusing wheels like the others. Ken is right that the focusers are interchangeable however the ED100's focusing tube is 220mm long whilst the ED80's are 160mm long. The longer focusing tube is great if you need a longer back focus. Please don't ask why I have so many scopes, I am seriously considering seeking help for this mysterious condition or affliction.
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