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


Richard wrote:

I found Kingslake's explanation helpful.  (Rudolf Kingslake, "Lens
Design Fundamentals"; I think I got my copy from Willmann-Bell).


Richard,

I have edition #1 1978 got it from Willman-bell that year... pages 317-320
have been fingered over so many times the print is almost gone.  The rest
of the book I understood perfectly .  It is written well, and
understandably. I'll be darned if I can explain it.  Thanks Rich.

Coyot‚
----- Original Message -----
From: "Richard F.L.R. Snashall" 
To: "mommoteandcoyote" 
Sent: Tuesday, January 21, 2003 12:28 AM Subject: Re: ATM An Old TMs Simple Query


>
>
> mommoteandcoyote wrote:
> > Guy's n Gals,
> >
>
> > 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! "
> >
>
> I found Kingslake's explanation helpful.  (Rudolf Kingslake,
> "Lens Design Fundamentals"; I think I got my copy from
> Willmann-Bell).
>
> Rick S.
>
> >
> > Talk with you soon,
> > Coyot‚
>
>
>

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