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  #101  
Old 05-10-2018, 04:15 AM
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Sounds like it is continuing to be a frustrating experience.

I hope in the end you will be in a better position than where you were with the GSO newt., considering the time and effort and $$ you have put in.

I presume big Mike S. didnt have the same issues with his OO UK scope.

Cheers Dave
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  #102  
Old 06-10-2018, 06:15 AM
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Slawomir (Suavi)
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Originally Posted by DaveNZ View Post

I presume big Mike S. didnt have the same issues with his OO UK scope.
No one messes with Mike...
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  #103  
Old 06-10-2018, 09:49 PM
sharpiel (Les)
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No one messes with Mike...

Not twice anyway...
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  #104  
Old 09-10-2018, 09:12 AM
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Quote:
Originally Posted by DaveNZ View Post
Sounds like it is continuing to be a frustrating experience.

I hope in the end you will be in a better position than where you were with the GSO newt., considering the time and effort and $$ you have put in.

I presume big Mike S. didnt have the same issues with his OO UK scope.

Cheers Dave
7 year difference in buying each scope Dave. I believe that Mike did have an issue with the corrector but I only heard this from someone who has had a lot of issues with them.

I don't think the optics are a problem overall, its the build quality I am most saddened about.

BTW the GSO scope is undergoing a rebuild my workshop. It will image again.
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  #105  
Old 30-10-2018, 09:22 AM
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I have decided to bring the scope home from the observatory. I have spent the last few days trying to firstly find the correct position of the secondary, testing a few ideas I have been given by others and some of my own.

When the scope was delivered it arrived with a large rectangular adapter which joined directly to the tube adapter (see picture, the plate is directly above the focuser board and below the Atlas adapter). That adapter prevents the camera and corrector from coming to focus and was not used during the last few months. On a hunch I put it back in the train and tried collimation with it in place. Collimation was a breeze, however, once removed it out of the optical train I noticed that the collimation was clearly out. Using callipers and a steel rule I can see that there is a little under a millimetre difference in the alignment of the two plates and the plate is about 1mm thicker at one end. I think this is partly why I cannot null out the correction across the field. I have noticed that if I rotate the corrector 180 degrees then the uncorrected part of the field follows this path. This is clearly tilt which is following the rotation. I am thinking this might actually be the focuser board being out of perpendicular from the optical path. Thoughts? Is there an easy way to test this idea?


Having said that though I collimated the scope without the extra plate as best as I could and performed a visual star test last night. Collimation looked ok generally with two diffraction rings presented. I am using an extension tube to gain focus and this slightly affects collimation as it is not seated all the way down, but overall there is no evidence of optical defects, nor does there appear to be astigmatism which I see with the corrector in place. Stars at focus appeared as refractor like points. At the very least this is optically a nice looking scope. Tonight I will try to null out the poor correction and try to eliminate the apparent tilt in the corrector. Though I am not sure how I will do this as the Atlas adapters don't have a way to pack them out. Perhaps it is operator error???
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  #106  
Old 30-10-2018, 09:38 PM
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My goodness Paul,

It sounds like you are having an Everest of a time each time with one of these instruments. Well done in persevering and not giving up until perfection can be achieved. Most people would have given up a long time ago and called it quits whilst going mad in the process.

You could easily set up a telescope tuning business with all your success in this area!

Hope all ends well with this scope.

John K.
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  #107  
Old 31-10-2018, 01:48 PM
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Well done in persevering and not giving up until perfection can be achieved. Most people would have given up a long time ago and called it quits whilst going mad in the process.

2nd'd. Having read this thread and followed the "journey", I'm actually quite inspired. I don't possess such self control and composure - though at my age, I should.

I guess Paul, you've become more acquainted with your new scope than the average customer. Hope it brings you joy from this point on
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  #108  
Old 01-11-2018, 12:23 AM
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Quote:
Originally Posted by Paul Haese View Post
I have noticed that if I rotate the corrector 180 degrees then the uncorrected part of the field follows this path. This is clearly tilt which is following the rotation. I am thinking this might actually be the focuser board being out of perpendicular from the optical path. Thoughts? Is there an easy way to test this idea?

I assume when you rotate the corrector, the camera rotates with it, and there is no rotator in the mix?

If the focuser board is out of perpendicular from the optical path, surely it must be thicker on one side than the other, no? as the telescope tube has to be cylindrical. I think you've done the right thing with the measuring tools and rotating the corrector (and camera with it?)



Quote:
Originally Posted by Paul Haese View Post
Though I am not sure how I will do this as the Atlas adapters don't have a way to pack them out. Perhaps it is operator error???

Atlas adapters are dovetail? if so, you can still pack them out with a shim pushed in between the two parts, and the dovetail just wont tighten up so much, if i understand you correctly.


Josh
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