Re: [ATM] FigureXP - monte carlo analysis

["Bob May" <rmay@nethere.com>]

Don't know what errors you made, but a 14" FL is about 28" and a
two thou error in distance is still pretty darn small, like about
0.00015% error or thereabouts.  The thing is thqt the Monte Carlo
does expect that the input be somewhat normalized to a 0 level.
The easiest way for the data sets that we do is to just set the
first zone to 0 and the rest of the set runs off from there.
Bob May

rmay at nethere.com
http: slash /nav.to slash bobmay
http: slash /bobmay dot astronomy.net

----- Original Message -----
From: Mitchell R <funnybone101@embarqmail.com>
To: <atm@atmlist.net>
Sent: Saturday, May 17, 2008 12:18 AM
Subject: Re: [ATM] FigureXP - monte carlo analysis


>
> Systematic errors like making all of the readings several
> thousandths of an inch off in one direction won't matter.  The
> end error is so small that the shape of the surface will
> completely wash them out.  Two thou over the hundrred inchs or
so
> is a real small error.
> Bob May
>
>
> True but if you're talking about fast mirrors, F/4 and below,
.002 become a
> BIG deal, I was using the wrong numbers on my 4.5" F/3.75 and
the average
> readings dropped noticeably. Not enough to break the mirror,
but enough.
>
> Mitchell
>
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> ATM mailing list http://www.atmlist.net/
>

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