I was puzzling over why Gijs and myself got seemingly conflicting information from Meopta about the Meostar prisms.....
I have received an emergency call on the hotline that an 'International Incident' may be unfolding :eek!: and that my urgent assistance is required! oWell, in that case Meopta speaks with dubble tongues, since its employees then give quite different messages......
"It insists that there are four possibilities regarding any statement: it might be true (and true only), false (and false only), both true and false, or neither true nor false."
You need an Australian to explain these things.
Chosun Juan, thanks for those (other) links.
LOL. 3 :t:its easy mate, turn off FB and phone, sit on verandah, grab a coldie, watch sunset, listen to kookaburras for a while, realise you are hanging upside down from bottom of planet but not falling off .... then it all comes clear!
Hi David,CJ,
I mentioned back it #18 that I thought Meopta might use enhanced silver coating. Although that was part of my question to Meopta, I'm sure it will remain one of their little secrets. Both phase coating and the 'enhanced' bit are technically dielectric, even if it is rarely mentioned. No doubt, one way or another the Meostar prisms are dielectric coated. The real subject of the debate was whether the principle mirrored surface was silver coated. I think I got a clear answer on that.
A more interesting question is whether any other top manufacturers are keeping quiet about using silver as well? Looking at some of the transmission spectra it looks like it is a distinct possibility, but I'm sure they are not going to admit it. :-O
David
Is it just me - or does he have an uncanny resemblance to Borat ?!! 3Jape you know all about this (though you have let the side down, et tu Chosun Juan): [Link]
But I bring it up here to use this chance to promote it.
Though not an Australian I have always (since I first understood maps as a kid) been a proponent of this.
Also aesthetically to me so much prettier than "North-Up", more so the "Physical" (i.e. contra Political) maps with greens and browns.
If only it were that simple ! :-OGraham Priest, Prof. Emeritus, Uni. of Melbourne,
on the principle of 'catuskoti' in Buddhist philosophy (link):
"It insists that there are four possibilities regarding any statement: it might be true (and true only), false (and false only), both true and false, or neither true nor false."
You need an Australian to explain these things.
Chosun Juan, thanks for those (other) links.
Adhoc, I think things have progressed a bit since then, from the back rooms populated by propeller heads, to industry supply chains, and even into the public domain. See the links in my initial post to see some of the materials widely in use. Even this Wiki entry contains some of the common materials https://en.m.wikipedia.org/wiki/Optical_coatingOn Schmidt-Pechan mirror coatings.
Walter E. Schoen in Astronomie.de: post #249103, July 23, 2005.
Translated by Google.
"There are virtually no details in the literature (eg in physics or especially in optics textbooks), as each manufacturer keeps his secrets for himself and often even waives patenting, because this would result in a disclosure..."
Chosun,
Thank you for your humorous and informative intervention to prevent WW-3.
Gijs van Ginkel
its easy mate, turn off FB and phone, sit on verandah, grab a coldie, watch sunset, listen to kookaburras for a while, realise you are hanging upside down from bottom of planet but not falling off .... then it all comes clear!
Thanks for your help in coming to this conclusion. It's finally making sense to me. (Thanks also to David for pointing out privately that concerns about oxidation of silver [based?] coatings are easily exaggerated.)I think your conclusion is correct - the mirror is a silver based dielectric coating. We aren't of course privy to how many 'enhancement' layers on top of the protected silver coating it takes before it constitutes a dielectric coating.