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Old 17-08-2019, 10:06 PM
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lazjen (Chris)
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Collimation for GSO RC10 - need help

I've done a lot of searches and read a few guides, but I'm unsure what's the best way to sort out the collimation mess that my GSO RC10 (CF version) is in right now (I seem to be getting stars that look like comets).

For those that have this scope or have used it, what do I need to get/use to sort this out properly?
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Old 18-08-2019, 02:21 AM
glend (Glen)
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Patience and a sense of humour, and a Tak collimation scope.
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Old 18-08-2019, 07:07 AM
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jwoody (Jeremy)
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Hello Chris
I have a RC10 also and use the Tak collimation scope with success. I have read others have success with howie glatters and such but I think the Tak scope is the most common tool.
If you are ever down Gold Coast way bring your scope to my place and we can get it sorted out.
Jeremy
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Old 18-08-2019, 08:45 AM
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lazjen (Chris)
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Quote:
Originally Posted by glend View Post
Patience and a sense of humour, and a Tak collimation scope.
Given how long it's taken to get (back) to where I am now, I think I can managed some more patience.

Looks like I'll be buying a Tak Collimation Scope in the near future.

Quote:
Originally Posted by jwoody View Post
Hello Chris
I have a RC10 also and use the Tak collimation scope with success. I have read others have success with howie glatters and such but I think the Tak scope is the most common tool.
If you are ever down Gold Coast way bring your scope to my place and we can get it sorted out.
Jeremy
Jeremy, thanks for the offer. I may take you up on that if I can't work out what to do. I think that the Tak scope is the most feasible way to go as it looks like I can actually buy one.

====

On a different path - I was reading that I should only be adjusting the secondary mirror. How can I tell that the primary mirror is not an issue?

Chris
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Old 18-08-2019, 12:22 PM
glend (Glen)
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Chris if you bought it new then the primary should be pretty good, as they are setup in the factory. The problem comes with used scopes where people who Don't know any better try to collimate them like newts. Once that primary has been moved you could be in a world of trouble. Unfortunately that is when folks tend to sell them on to someone else.

Imho, Just follow the standard GSO RC approach, centre your focuser to the secondary centre spot first. Get the optional collimation ring from Andrews if you don't have one, it allows you to adjust the aim of your standard laser inserted into the focuser. Then concentrate on the TAK collimation scope view to get the secondary correct to show equidistant ring alignment.
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Old 18-08-2019, 05:00 PM
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lazjen (Chris)
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I did buy it new a few years ago and I've obviously never touched it before. I'll follow the normal approach and see what happens.

I got a PM that mentioned that I should get the collimation ring as well, so I will do that too.
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Old 08-09-2019, 04:53 PM
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lazjen (Chris)
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I've got the tilt plate for collimation. How do I determine the tilt from the focuser? I am assuming the circle from the tak scope shouldn't appear to move when the focuser is rotated?
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Old 08-09-2019, 05:54 PM
brisen (Brian)
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Hi Chris

You will need to use a laser to centre the focused onto the secondary. Use the adjusters on the tilt ring to get the laser centred on the secondary. Then use the task scope to get the collimation right.

Brian
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Old 08-09-2019, 06:06 PM
glend (Glen)
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Quote:
Originally Posted by lazjen View Post
I've got the tilt plate for collimation. How do I determine the tilt from the focuser? I am assuming the circle from the tak scope shouldn't appear to move when the focuser is rotated?
Well the way I did it was to use my laser collimator in the focuser, you want it to hit the centre spot on the secondary precisely. Then the TAK scops after that. Where you place the Collimation ring in the spacer train is important, don't put it up front where it will block the primary adjusters.
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Old 08-09-2019, 07:38 PM
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lazjen (Chris)
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Ok laser beam it is. Will have to sort something out for that.
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Old 08-09-2019, 10:49 PM
glend (Glen)
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Originally Posted by lazjen View Post
Ok laser beam it is. Will have to sort something out for that.
Look that is just a suggestion based on how I did it others might chime in too. It maybe very possible to do it all with a TAK Scope.
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  #12  
Old 09-09-2019, 07:34 AM
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lazjen (Chris)
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Maybe, but I think getting the tilt sorted will be easier by other means.

I was informed about this: https://www.rafcamera.com/adapter-m1...f-to-m48x0-75m. Looks like I can get an adapter to take the focuser out of the equation. Might get it.

I can then deal with the focuser tilt as a separate issue - which will probably still need some form of laser to sort out efficiently. If I could be 100% certain that the collimation is correct, then the tilt could be sorted out by taking images and analysing the results in PI (which I will do at least as a final check anyway).
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