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Dear Brad,
Thanks for the video.

You wrote:

> I am unsure as to what utility, if any, anti-reflective lenses would have in 
celestial navigation.  AR coatings attenuate the light transmitted through 
the lens. 

Apparently this is not so: AR coating INCREASES the amount of light passing 
through the lens, not attenuate it.
See, for example:

https://en.wikipedia.org/wiki/Anti-reflective_coating

First I was a bit confused with terminology, but when I found the Russian 
translation of AR, I realized that this is
very familiar to me. The Russian term is more suggestive "????????????? ??????" which literally means
"enlightened optics". It allows MORE light to pass by surpressing reflection.

The reason to use it in astronomical instruments is exactly the same as the 
reason for its use in binoculars.
It must be especially important in the night (Galileo) scopes.

Alex.
 

   

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