From: Larry Sayre 
To: hermit 
CC: atm{at}shore.net
Reply-To: Larry Sayre 


hermit wrote:

>What were the final pv and rms errors?  Are they significant for your
>design?
>
>
Here are the numbers:

Auto Cell Design (answer in a few seconds): P/V error = 1.56425e-05, RMS
error = 2.50472e-06

Optimized (~20 minutes of seeking solutions): P/V error = 1.65284e-05, RMS
error = 2.49876e-06

Not much difference in the RMS error, but the P/V error looks perhaps
significantly different.  Differences in the calculated triangle placement
radii are nill, but all of the triangle dimensions differ by a few mm.  I
have no idea if these cell induced error results are significant for my
design (as in should I be seriously considering a 36 point or 54 point
option, neither of which which seem to function in my version of PLOP).  I
do know that the PLOP 'Auto Cell Design' numbers for a cell calculated with
fixed criteria based on the 'Cell' program (or as taken straight out of
'The Dobsonian Telescope' book) are worse (significantly worse, again I
don't know) than either of these sets of error figures, with P/V eror at
1.77e-05, and RMS error at 3.23e-06.

Basic mirror criteria used:

762mm diameter
40mm thickness
130mm central obstruction
Pyrex
3048mm FL

Lawrence Sayre

--
My philosophy, in essence, is the concept of man as a moral being, with his
own happiness as the moral purpose of his life, with productive achievement
as his noblest activity, and reason as his only absolute.

Ayn Rand (in the appendix to 'Atlas Shrugged')

--- BBBS/NT v4.00 MP