From: "mommoteandcoyote" 
To: 
Reply-To: "mommoteandcoyote" 


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Guy's n Gals,

I have asked a few of the guys, on the side, this question...Well, now =
I'm putting it before the board. (Gulp), Here goes...

I have been building small Schmidt systems for many years now, = configured
as prime focus cameras, visual Newtonians, and  photo/visual = Cassegrains.
  Primarily, I've been using Everhart's variation of =
"Grandpa" Bernard's vacuum pan method for producing the corrector
= plates, with very good results.  His math was, and still is, quite easy =
for me to understand and relate to the actual physical, quantifiable, = and
mechanical functions necessary to produce the desired optical effect = upon
the system as a whole.   However, in all the years of walkin' =
around the bench and holding my eye precariously close to a very sharp =
object, peering earnestly, hour upon hour, past a little spot of light, = I
have never been able to grasp the basics of the polynomial equations =
necessary to describe the specific profile on a specific corrector plate =
and how it actually relates to the plate.  You know, the old

 a*rho^2+b*rho^+b*rho^4...

 The coefficients of the even aspheric I think is what it's called.  How =
does this become the 3 expressions that are used  when referring to a =
specific plate, AND WHAT ARE *THEY* WITH REFERENCE TO THE PLATE?  Call = me
dense... Call me 'tupid... But over my head it goes...     In any =
case, these and other related equations plum stump the ol' Coyote.  I = can
create the proper curves on the glass at the bench, but I'll be = damned if
I can figure it out mathematically so I can enter it into a = computer
program.  Chuckle, chuckle,
 chuckle!

 Any help you all can lend would be GREATLY appreciated! "



Talk with you soon,
Coyot=E9

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Guy's n Gals,
 
I have asked a few of the guys, on the side, this question...Well, =
now I'm=20
putting it before the board. (Gulp), Here goes...
 
I have been building small Schmidt systems for many years now, =
configured=20
as prime focus cameras, visual Newtonians, and  photo/visual=20
Cassegrains.   Primarily, I've
been using Everhart's =

variation of "Grandpa" Bernard's vacuum pan method for producing
the = corrector=20
plates, with very good results.  His math was, and still is, quite
= easy for=20
me to understand and relate to the actual physical, quantifiable, = and=20
mechanical functions necessary to produce the desired optical effect = upon the=20
system as a whole.   However, in all the years of walkin'
= around the=20
bench and holding my eye precariously close to a very sharp object, = peering=20
earnestly, hour upon hour, past a little spot of light, I have =
never been=20
able to grasp the basics of the polynomial equations necessary to
= describe=20
the specific profile on a specific corrector plate and how it = actually=20
relates to the plate.  You know, the=20
old a*rho^2+b*rho^+b*rho^4... The
coefficients = of the=20
even aspheric I think is what it's called.  How does this become = the 3=20
expressions that are used  when referring to a specific
plate, = AND=20
WHAT ARE *THEY* WITH REFERENCE TO THE PLATE?  Call me dense... Call =

me 'tupid... But over my head it=20
goes...     In
any case, these and other = related=20
equations plum stump the ol' Coyote.  I can create the
proper = curves=20
on the glass at the bench, but I'll be damned if I can figure
it=20 out mathematically so I can enter it into a computer
program.  =

Chuckle,
chuckle, chuckle! Any help
you all can = lend would=20
be GREATLY appreciated! "
 
 
Talk with you
soon,Coyot=E9

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