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Difference in height is not really a major concern (binoviewers can adjust for that, or a small spacer sleeve can be placed on one EP).
Small differences in focal length would be the worst. But I assume these EPs all use precisely figured identical lenses.
So really the main concern I have is about the coatings. The Elites are multicoated (MC) but not fully-MC (FMC) like the Parks GS. (They're still very good EPs and can't complain about transmission or contrast.) I also have a 35mm Ultima which is also FMC and has a very apparently different coloured coating to the Elites, i.e., when you look at the lens, not through it.
I don't have identical focal lenghts of any two variants so I can't make a direct comparison. That's why I'm asking if I'll get headaches like some folks in old school 3D cinemas where you wore red-blue glasses.
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