Re: [ATM] Ronchi testing

["Mike Warne" <mwarne@network2000-hi.com>]

Hi Jerry,
I know this is probably obvious, since this is not your first mirror...  but
how stable is your testing setup, and your tester itself? I had problems
testing my mirror if I leaned or put any weight on the desk holding the
tester.  Even carpet on the floor can be a problem if people walk near your
setup..
Could your tester be sticky, or have a loose knife edge so that you can not
reproduce your readings?


Also is it possible to use a grating to star test the mirror in it's cell?
Ronchi lines should be straight when looking at a bright star.

Mike

----- Original Message ----- 
From: "Jerry B. Hillman" <JBHillman@ev1.net>
To: "Vladimir Galogaza" <vladimir.galogaza@zg.tel.hr>
Cc: "The Amateur Telescope Makers List" <atm@atmlist.net>
Sent: Sunday, May 09, 2004 10:56 AM
Subject: Re: [ATM] Ronchi testing


> Hi Vladimir,
> Obviously, I can't do Ronchi testing right either. The test program I am
> using, Ronwin20, shows three lines either side of center when I set it for
> the parameters of the mirror.
> 16.5" diamter.  149.5 ROC.  100 lines per inch grating.  0 offset.
> What is wrong?
> Clear skies, Jerry
>
>
> _______________________________________________
> ATM mailing list http://www.atmlist.net/

_______________________________________________
ATM mailing list http://www.atmlist.net/