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Help with collimation of SW 150P reflector
http://www.boltonastro.co.uk/forums/viewtopic.php?f=8&t=55
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Author:  imartin [ Sat Jan 09, 2010 12:28 am ]
Post subject:  Help with collimation of SW 150P reflector

Although I have had my scope for over a year I have yet to grasp the ability to effectively collimate it, I seem to get close, just not close enough!

I have read guides, explanations etc but still cannot manage it.

Is it possible that someone could give me one to one tuition and run through the steps. I think I understand the basic principle just can't put them into practice.

I do have the required equipment - a laser collimator etc.
I am guessing that it is not practical to do on a BAS meeting night due to time constraints and availabilty of venue etc.

I am willing to travel and work a round a person availability.

Author:  DRatledge [ Sat Jan 09, 2010 8:32 pm ]
Post subject:  Re: Help with collimation of SW 150P reflector

Ian,
I am probably nearest to you but until the gritter lorries appear I am a bit stuck.
To be going on with - lasers are very tricky and a better solution is to use a barlowed laser (laser stuck into a balow lens) in combination with a central doughnut (adhesive reinforcing ring) on the mirror. This link explains it quite well:
http://www.cameraconcepts.com/barlowed% ... mation.pdf
If you are still stuck then after the snow melts I can pop over.
David

Author:  imartin [ Sat Jan 09, 2010 9:15 pm ]
Post subject:  Re: Help with collimation of SW 150P reflector

Hi David,

I am lucky in the fact that my scope comes with a doughnut / file reinforcer as standard.

I have problems recognising if I have the secondary correctly aligned under the focuser etc.

I also find that when I think I have achieved collimation I can check it again an hour or a day later and it is out again - without having used or banged the scope.

I really do appreciate your offer of assistance. I am more than willing to travel to you.

regards,

Ian

Author:  DRatledge [ Sun Jan 10, 2010 12:01 pm ]
Post subject:  Re: Help with collimation of SW 150P reflector

Ian,
I am in all day Monday waiting for DHL to collect my failed observatory PC so if you can pop over then I can have a look - something sounds loose if it changing collimation that easily.
If you email me: davidr AT deep-sky.co.uk I will send my address.
David

Author:  imartin [ Sun Jan 10, 2010 9:36 pm ]
Post subject:  Re: Help with collimation of SW 150P reflector

Hi David,

I would not be able to make it to yours during the day. i would only able to get to yours in the evenings, between 7 & 8pm.

If that is not convenient for you thats understandable.

Author:  DRatledge [ Sun Jan 10, 2010 9:58 pm ]
Post subject:  Re: Help with collimation of SW 150P reflector

Ian,
No problem tomorrow night. Do you have my address?
David

Author:  imartin [ Mon Jan 11, 2010 1:00 pm ]
Post subject:  Re: Help with collimation of SW 150P reflector

David,
Did you receive my email - have you sent your address to my hotmail account?

I am unable to access hotmail while at work but will check when I get home.

i will bring my collimator etc.

Thank you in advance.

regards,

Ian

PS Hopefully DHL turn up today and you are not sat in the house for no reason.

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