From: "Rob" 
To: 
Reply-To: "Rob" 


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Hello all,

I'm new to the list. Hopefuly I won't get flamed for this..I have looked
around and can find very little info on Ritchey-Chretien telescopes in
general. I have found enough info to know that I want one :)

I'm thinking about trying to grind the optics myself. And hence my
questions. I know that the surface of a Ritchey-Chretien is hyperbolic
instead of parabolic. What I'm curious about is, how much harder is a
hyperbolic surface to grind and test compared to a parabolic surface? Is =
it
only slightly harder? Or is it sveral orders of magnitude harder? In = what
ways does the process differ (ie same tools for testing and such?). Has
anyone here even attemped this before?

I really want to build one of these scopes and then do some = astrophotography
with it..I'm thinking I might try the first one with a 6" or 8"
primary, just in case things don't work out well. BTW It has been a while
but I = do
have some previous experience grinding a 6" mirror with my father (when = i
was about 15 or 16 hehe). So I'm not totaly new, but I'm probably just a = bit
rusty hehe....

So what do you guys think?? Is this possible or just a pipe dream?

Rob

P.S. sorry if this message posts twice.. (do you have to have ATM in the =
subject line to post?) I forgot to in my first email..


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Hello=20
all,I'm new to the list. Hopefuly I won't get flamed
for this..I = have=20
lookedaround and can find very little info on Ritchey-Chretien =
telescopes=20
ingeneral. I have found enough info to know that I want one =
:)I'm=20
thinking about trying to grind the optics myself. And hence =
myquestions. I=20
know that the surface of a Ritchey-Chretien is hyperbolicinstead
of=20 parabolic. What I'm curious about is, how much harder is
ahyperbolic = surface=20
to grind and test compared to a parabolic surface? Is itonly = slightly=20
harder? Or is it sveral orders of magnitude harder? In whatways
does = the=20
process differ (ie same tools for testing and such?). Hasanyone
here = even=20
attemped this before?I really want to build one of
these scopes = and then=20
do some astrophotographywith it..I'm thinking I might try the
first = one with=20
a 6" or 8" primary,just in case things don't work out
well. BTW It = has been=20
a while but I dohave some previous experience grinding a 6"
mirror = with my=20
father (when iwas about 15 or 16 hehe). So I'm not totaly new, but = I'm=20
probably just a bitrusty hehe....So what do
you guys think?? = Is this=20
possible or just a pipe
dream?Rob
 
P.S. sorry if=20
this message posts twice.. (do you have to have ATM in the subject line = to=20
post?) I forgot to in my first email..


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