Re: pointing accuracy


Ray Gralak <ray@...>
 

Hi Colt,

Yes, from one part of the sky to the opposite side I have
seen better than 2-arc-minutes accuracy. To get this kind
of accuracy you need to make sure your OTA is orthogonal
and that none of the optical elements shift in movement
(e.g. many SCT's primary mirrors will shift when you move
to another part of the sky). That is why I said I get this
accuracy with my refractor.

Take care,

-Ray

-----Original Message-----
From: Colt Bednorz [mailto:colt@...]
Sent: Saturday, May 06, 2000 8:44 AM
To: ap-gto@...
Subject: Re: [ap-gto] pointing accuracy


Ray,
So, it's not only on the chip of a st7/8, but not too far off center.
I looked at what u see and that would even hit the st-4's
little chip for a standard sct.
Thanks
Colt

Ray Gralak wrote:

Hi Colt,

With really good polar alignment (and my 5" refractor) I have
seen better than 2 arc-minutes accuracy on my 1200 GTO. And most
of that error could be from non-perfect polar alignment.

Taka care,

-Ray Gralak

-----Original Message-----
From: Colt Bednorz [mailto:colt@...]
Sent: Saturday, May 06, 2000 7:59 AM
To: ap-gto@...
Subject: [ap-gto] pointing accuracy



What is the pointing accuracy of the A.P.1200?
Assuming everything is accurately set up, and polar
aligned, what do you normally get?
I would imagine that this feature, which I've never had, is
pretty nice for imaging those faint invisible objects.

Thanks
Colt Bednorz


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