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collomation tools

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17 years 3 months ago #44117 by fguihen
collomation tools was created by fguihen
Each time i take the scope out, i try adjusting the collomation. i do this for about an hour until i get as close as i can to perfect, however, im not sure if my collomation is accurate. i try using the startest. i just get bored and cold and start viewing objects. i want to be able to collomate quickly and easily, to a good degree of accuracy. are there any tools that help me do this on a SCT?

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17 years 3 months ago #44127 by philiplardner
Replied by philiplardner on topic Re: collomation tools
I'm not an expert on collimating SCTs, but my understanding is that once you get it right, you shouldn't need to touch it again unless the scope receives some very rough handling to rattle the optics. They are pretty difficult to knock out of alignment. When star-testing, the star >must< be smack bang in the centre of the field of view or the diffraction rings will always appear decentred.

Phil.

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17 years 3 months ago #44128 by Matthew C
Replied by Matthew C on topic Re: collomation tools
Phillip is right! You should only have to collimate it maybe once every 6 months! Do you have Bobs Knobs?

We shall not cease from exploration
And the end of all our exploring
Will be to arrive where we started
And know the place for the first time. . . .
T. S. Eliot
A wise man....

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17 years 3 months ago #44131 by fguihen
Replied by fguihen on topic Re: collomation tools
no, never got bobs knobs. to install them id have to remove the screws completely putting my scopy out of collomation and im to afraid to do that!

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17 years 3 months ago #44133 by Matthew C
Replied by Matthew C on topic Re: collomation tools
They were already installed on my scope when i bought it! :D There are so many collimation tools out there! I know people who swear by the cheshire method then others who like the laser mate! Ive never collimated in my life so i cant help much!

We shall not cease from exploration
And the end of all our exploring
Will be to arrive where we started
And know the place for the first time. . . .
T. S. Eliot
A wise man....

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17 years 3 months ago #44141 by jhoare
Replied by jhoare on topic Re: collomation tools

I'm not an expert on collimating SCTs, but my understanding is that once you get it right, you shouldn't need to touch it again unless the scope receives some very rough handling to rattle the optics. They are pretty difficult to knock out of alignment. When star-testing, the star >must< be smack bang in the centre of the field of view or the diffraction rings will always appear decentred.

Phil.

You should use a reticle eyepiece when collimating using this method. It's the best way of centreing the target. And if possible make Polaris your target - minimal movement.

I have a C5 for nearly 3 years and I've only had to adjust it once but without the reticle eyepiece (which I normally use for aligning finders) I would have found it difficult.

John

Better that old people should die of talk than to have young people die in war.

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