Re: ATM 6" Mirror

["Richard Schwartz" <richas@idt.net>]

When you rotated the mirror in its cell, did the astigmatism rotate with the
mirror?

Also, how is your diagonal mirror mounted to the spider assembly?  Is it
glued in there, or what?

Stick with us, we will solve this thing.   It is very unusual for a full
thickness mirror like yours to have astigmatism.

. . . Richard
----- Original Message -----
From: <Viper71049@aol.com>
To: <atm@shore.net>

> Tried adjusting EVERYTHING last night.  rotated, adjusted, collimated, It
has
> to be in my mirror. I did rotate the mirror a quarter turn in one
direction
> and did rotatet the pitch a quarter in another. How do you (  rotate the
> tilting lens with the eyepiece )?

I don't think you will need this to correct your astigmatism.   But if there
is a tilting lens in your eyepiece, you just rotate the eyepiece.  By
rotating and tilting, you can usually find a combination that cancells the
astigmatism.

> system has no coma because I see a bunch of stars Its just the brighter
ones
> are just stretched.

No, it is just that when the faint stars are stretched, you can't see them
any more.  Believe me, all light is stretched equally.

> have a Slitless type but dont know how to use it.

You need to add a pinhole to your tester so that you can check for the
Yin-Yang  effect.   I don't think you will see the twist in a mirror with a
slitless tester.

. . . Richard