Re: [ATM] Testing a Scope. i'm astigmatic and myopic

["Jerry" <wa4guu@verizon.net>]

It is simple to see if it is your eyes or the scope. Rotate your eye
relative to the scope. If the orientation of the cross stays the same
relative to the scope, it in the scope. If the orientations stays the same
relative to your eye, it is in your eye.

Since it is a mak I think I'm safe guessing that you do not have a spider
supporting the secondary.

Jerry

-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
Ian McKernan
Sent: Friday, February 23, 2007 9:25 AM
To: atm@atmlist.net
Subject: [ATM] Testing a Scope. i'm astigmatic and myopic

Hmm, if this is inappropos say, but i am after info on a star test of a
little 130mm Mak Cass. I have read up that the out of focus image being
different inside and out of focus is not an issue like it is for a newt.
However, even when i was testing my first mirror i knew i was always going
to see some astigmatism since i am short sighted and astigmatic. I tend to
observe with my glasses off since most of my eyepieces re not the best for
eye-relief.

The query is that the in focus images at 200x magnification show the stars
as crosses?? Anyone have any ideas as to whether this is the scope or my
astigmatism??  No surgery has been done, and the myopia is compensated by
focusing.  Any opinions welcomed!


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