Kirjoittaja Aihe: GSO RC6 Collimation help  (Luettu 562 kertaa)

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GSO RC6 Collimation help
« : 26-09-2018, 19:06:22 »
Hello Guys,

I have a RC6 that Iit is badly collimated, I have tried a couple of times to collimate it with the laser tool, I have tried using a star, but it was not good. Sine I dont want to sell it, is there anyone knows to do and is willing to help?

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Marcelo

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Vs: GSO RC6 Collimation help
« Vastaus #1 : 26-09-2018, 20:52:16 »
Hello,

You can check this. https://m.youtube.com/watch?feature=youtu.be&v=tgtdhWVePQA
Only difference is rc6 may not have focuser collimator. Maybe best English source for collimation tips is Cloydynights forum.

Br.Astroile

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Vs: GSO RC6 Collimation help
« Vastaus #2 : 26-09-2018, 21:12:27 »
I have a RC6 that Iit is badly collimated, I have tried a couple of times to collimate it with the laser tool, I have tried using a star, but it was not good. Sine I dont want to sell it, is there anyone knows to do and is willing to help?

Hi,

Based on my long(ish) experience with RCT-collimation, your best bet to get that 6" RCT back into the correct collimation will be this guide:
http://www.deepskyinstruments.com/truerc/docs/DSI_Collimation_Procedure_Ver_1.0.pdf

Here are some examples from a scope, which has been collimated with the principles of that DSI guide. It's a RCT scope, which has been disassembled many times totally and then put together. You can find lots of images for the RCT collimation principles from that message thread too (please use Google translate where applicable).  In practise, you can get your scope into nearly perfect shape with your bare eyes only.

You just need to learn how to interpret those reflections you see coming from the front (or the back) of your RCT tube, and then adjust mirrors so that everything becomes concentric in those reflections. Nothing more is needed, but you might benefit also from some collimation tools to get started.

1.) Single-beamed lasers are good only for the rough collimation of the secondary mirror. No help for the main mirror adjustment.
2.) Holograhic lasers (with projected rings or grid) can be used for collimation of both mirrors in rough level.
3.) Takahashi collimation scope is a good tool for collimating both of the RCT mirrors. One severe drawback there is that it relies on the mechanical accuracy of your scope parts. If focuser or secondary mirror or primary mirror are not centered properly, then Tak collimation scope can give you only half-way-perfect results. But if those mechanical parts are totally perfectly aligned to the center of the optical axis of the scope optics, then Tak scope will be the fastest way of getting RCT scopes into 95% collimation level.

Then you can try the Hall of mirrors view for collimating scope's secondary mirror. That equals the #1 tool (single-beamed laser), but it only applies when primary mirror is almost fully collimated. So don't expect that to give any good results with poorly collimated primary mirror.

Lots of other RCT-collimation related images can be seen here: https://astrokuva.galleria.fi/kuvat/Kuvauslaitteistot/GSORC10/
And here: https://astrokuva.galleria.fi/kuvat/Kuvauslaitteistot/GSORC10/Collimation_guide/ (all images explained in that 10" RCT message thread)
Here's that 10" RCT thread in this forum: https://www.avaruus.fi/foorumi/index.php?topic=11148.0

Good luck! Collimating a RCT scope is not impossible, but it has very low tolerances for the optical and mechanical part adjustment accuracy. I have used and analogue of putting two raw eggs on top of each ones. When you get those in balance, then your RCT scope will be is 100% collimation too.  :tongue:
- Timo Inkinen

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Vs: GSO RC6 Collimation help
« Vastaus #3 : 26-09-2018, 21:15:45 »