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Old 09-06-2010, 09:35 AM
Campton-Jones
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Location: Casino Australia
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Astrophotography in Northern NSW

This is my first post and I'm not sure if it in the right place.
I am wondering if there is anyone in the Lismore, Ballina, Kyogle and Casino areas doing Astrophotography.
I need some help autoguiding.
I don't quite understand why my images are trailed when the guide star doesn't move.
You will find some of my meagre attempts here
http://home.exetel.com.au/mimasdigital/

Stephen
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Old 09-06-2010, 10:02 AM
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Terry B
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Location: Armidale
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I'm a bit too far away in Armidale but I'm sure there will be someone closer.
How are you guideing?
With an off axis guider or a second scope.
I have found the most common problem with trailing if you can keep a guide star centered is flexure between 2 scopes. This won't occur with an off axis guider but the choice of guide stars is much less.
I use 2 scopes but have tried to minimise the flexure. Even so I still will get a little trailing after 10 mins depending on where I point in the sky.
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Old 09-06-2010, 10:20 AM
Campton-Jones
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Terry Thanks for your reply
I had not thought of flexure
I have a 60mm Refractor I guide with.
How do you find the flexure?
Stephen
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Old 09-06-2010, 11:37 AM
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Terry B
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Quote:
Originally Posted by Campton-Jones View Post
Terry Thanks for your reply
I had not thought of flexure
I have a 60mm Refractor I guide with.
How do you find the flexure?
Stephen
Sounds like you probaably have found the flexure.
The problem is eliminating it.
How are the 2 scopes mounted to each other?
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Old 09-06-2010, 01:24 PM
Campton-Jones
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The guide scope is mounted in the usual way, sort of.
I have an outer ring mounted on a piece of 1" "U" channel and an inner ring that is fixed to the guidescope with grub screws and there are 3 threaded rods from the inner ring to the outer ring.
Adjustment is by pulling the guidescope to the outer ring..... confused!
I can only see about .25mm of movement here when forced.
BUT BUT I removed the main mirror and there is about 2mm of movement of the mirror in the cell..


Stephen
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