It's not the coatings affecting the magnification--it's the effect the coatings seem to have on the refraction off the center of my right lens--they have different refraction indexes because of their thickness and magnification changes (I didn't notice it much when I wore the awesome huge glasses of the late 80's/early 90's, but now that my wife made me stylish, I see it more, since the sweet spot is smaller)--so when I look through something with only one eye and compare to the other, the positions of anything off center appear to change more than they really are. Probably not making sense--I'll bring my glasses to L&O and let you see for yourself... Dan On Feb 11, 2012, at 5:49 PM, Chuck Hards wrote:
You shouldn't be seeing a difference in magnification with coatings, assuming you're referring to anti-reflection coatings. You shouldn't experience more than a fraction of a wavelength of difference, which isn't enough for the brain to be concerned with. I suspect childhood trauma. ;-)
You'll get used to a difference in close-focus between eyes, probably around age 45-50. My eyes differ by about 14", but the brain can cope with that, given time. At least, mine did. My daugher laughs at me as I move books closer, then further away, as I search for a good middle-ground, even with non-prescription readers on.
I have mild astigmatism in both eyes, but even in my dominant right-eye, which I do most of my observing with, it's not enough to cause poor imagery at the eyepiece. I remove my glasses at the eyepiece and use the focuser to accommodate. As long as my astigmatism doesn't get much worse, I see tack-sharp images. Knock-on-wood.
When I can't detect Saturn's polar hood in my "planet killer", I'll know it's time for lasik. Crap. _______________________________________________ Utah-Astronomy mailing list http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy
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-- Daniel Holmes, danielh@holmesonics.com "Laugh while you can, monkey boy!" -- Lord John Whorfin