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Old 01-05-2020, 09:30 PM
glend (Glen)
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Cassegrain Primary, I messed up, Doh!

I am kicking myself for touching those screws, on my GSO 8" Classical Cassegrain. Ghosts of RCs past have come back to haunt me. It was fine The way it was, a week old, nice star test out the box. Stupid me decided to install a collimation ring (because it uses the same back plate and focuser as the RC model) and i installed it today. Initially things were going fine, then i touched the primary, just to tweak out a touch of optical misalignment. Things went to hell then, and i soon found myself back in the endless repititions of fix one thing and bugger something else up.
I tried research, built a light up target box to reflect the donut to do optical alignment, used lasers, Barlowed lasers, Cheshires, everything in my toolbox. I am missing something. Trouble is there are not many of these scopes out there, so no direct references to call on.
I need to go back to basics here and just get that primary back in alignment. Any suggestions?
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Old 01-05-2020, 09:47 PM
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multiweb (Marc)
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To recenter your primary you would need to put your scope in a rig and use something like the hotech laser board for the initial mechanical alignement otherwise it could be a lot of trial and error. Once you have your primary close you can start tweaking the secondary then iterate back between primary and secondary until you get everything aligned.
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Old 01-05-2020, 10:08 PM
glend (Glen)
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Thanks Marc, I think I have got it back. I have gone to the Orion Collimation instructions, which Doug sent to me, and it was not as far gone as I had feared. Nearly finished now. Thanks for your reply.


Update: all done, perfect now. Did a star test as well.

Last edited by glend; 01-05-2020 at 11:38 PM.
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