Re: [Fwd: ] ATMJ article on grinding a 6" by Russell and Germann

[cshaw@ghg.net (Charles W. Shaw)]

At 01:29 PM 2/12/97 -0800, Robert  C. Pfaff wrote:
>>They claim that the Endurobrite coatings on their secondary mirrors,
>>and I quote, "blows away ordinary enhanced coatings!". 
>>Is this claim legit or enhanced BS?
>>
>

>I am using a Endurobrite coating on my star diagonal but have
>have not tried to test this theory. Any comments ?
>
>Bob Pfaff
> 
>

Not sure if the comment is true on the poorer scattered light situation, but
I experienced an interesting situation collimating a friend's 16" with
Endurobright coatings.  I was using my laser collimator (680nm) and could
not see any trace of a red dot on the primary!!!!!!!!  It was only after the
primary eventually collected a small amount of dust would the red dot show
up.....

That sure impressed me! (maybe I am just easily amused/impressed??)

Chuck


>
>
Chuck Shaw      

cshaw@ghg.net (Home)
cshaw@gp801.jsc.nasa.gov (work)
http://www.ghgcorp.com/cshaw (feeble 1st attempt at a homepage)