From: "steve desfosses" 
To: "liste atm" 
Reply-To: "steve desfosses" 


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hi everyone,
today i received my 12.5" mirror from the coater (moonward vaccum =
coating) a mirror that i have finished a month ago.so it is not a =
recoating of an old one.when i was doing my little inspection of the =
coating i noticed a lot of "bubble-like" spots on the
surface.Ididn't = count,but there is a dozen, maybe more of them. the
bigest ones seems = nearly 1mm across.=20
I have written to the coater and he call these "spatter marks".
He say = that it is only cosmetical and it is a sign that the aluminum was
= evaporated quickly and with good durability. I don't know what to do =
with this... it is frustrating to look at a mirror and see those marks =
when you know you've work so carefully not to leave any scrath, or =
pinhole...
has anyone ever experienced this on an aluminum coating? thanks for your help...
steve desfosses

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hi everyone,
today i received my 12.5"
mirror from =
the coater=20
(moonward vaccum coating) a mirror that i have finished a month ago.so = it is not=20
a recoating of an old one.when i was doing my little inspection of the = coating i=20
noticed a lot of "bubble-like" spots on the surface.Ididn't
count,but = there is a=20
dozen, maybe more of them. the bigest ones seems nearly 1mm across.=20

I have written to the coater and he =
call these=20
"spatter marks". He say that it is only cosmetical and it is a
sign that = the=20
aluminum was evaporated quickly and with good durability. I don't know = what to=20
do with this... it is frustrating to look at a mirror and see those = marks when=20
you know you've work so carefully not to leave any scrath, or=20
pinhole...
has anyone ever experienced this on an =
aluminum=20
coating?
thanks for your
help...
steve =
desfosses

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