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The actual visible differences in real life are very small, often not visible at all.
The only exceptions I have found are the Baader BBHS coated prisms and mirrors.
The Baader ones also have their ClickLock eyepiece holders which are superb.
The views through the various dielectric ones are very very very similar...
I did not see any difference between the AP dielectric and the Baader dielectric when testing on my TOA130....
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