Re: ATM ronchi question

["AstroJack" <AstroJack@AVATM.com>]

Hal,

>   I went to the link you provided
> http://www.atm-workshop.com/ronchi-test.html  and although diagram  #3
very
> closely resembles what my mirror looks like under the test.

If you read the description of figure 3 it is an oblate ellipsoid.  And note
the added  "(gross under-correction)" on the description.  There is NO WAY
that if your mirror at all resembles figure 3 that you can be over
corrected.    If you were overcorrected then you would be seeing something
like figure 6.  As a parabola and hyperboloid are by definition an
"overcorrected" sphere.

Draw a inside & outside RoC picture using the paint program with 3,4 or 5
lins showing and perhaps a few of us can give you better advice.

Isn't this Fun!

Jack Day





----- Original Message -----
From: "Harold" <adams@rmci.net>
To: "John D. Upton" <jd-upton@texas.net>
Cc: <atm@shore.net>
Sent: Tuesday, January 29, 2002 3:26 PM
Subject: Re: ATM ronchi question


>
>
> .  Without a more specific description of exactly what you are
> > seeing, it would be impossible to guess which may be correct.
>
>   I went to the link you provided
> http://www.atm-workshop.com/ronchi-test.html  and although diagram  #3
very
> closely resembles what my mirror looks like under the test., i suspect it
is
> overcorrected as  the lines inside roc  looking from center of mirror to
top
> edge curve in and get closer together,  and from center of mirror to
bottom
> edge when outside roc they curve out and get further apart.. This would
> indicate overcorrection right?
>
> Hal
>
>
>