Collimation help!

[Dom1961]

I'm currently using a Cheshire and a cap, following astro baby's guide but this is what I get? The centre circle is miles away from the secondary mirror but is under the cross hairs? Help!

[dweller25]

Hard to tell but It looks like the secondary is not centered below the focuser drawtube.....

[Moonshane]

I'd start again. Try my guide (Google moonshane collimation and you will find a pdf).

[Dom1961]

This is how it looks through the focuser it looks centered?

[Moonshane]

Where are you? If near Stockport I can help

[Dom1961]

I'd start again. Try my guide (Google moonshane collimation and you will find a pdf).

I can't find it

[Moonshane]

http://stargazerslounge.com/mobiquo/smartbanner/ads.php?referer=http%3A%2F%2Fstargazerslounge.com%2Ftopic%2F197640-collimation-and-star-hopping%2F&code=51acc326a289fd6f53518aef4a0a2607&board_url=http%3A%2F%2Fstargazerslounge.com

I think this will work but not sure as on phone

[Dom1961]

No where near Stockport unfortunately xD

[Dom1961]

Sorry, I am a bit behind on refreshing the feed xD

[Dom1961]

It doesn't work, just takes me to sgl home

[Gutross]

still looks quite a bit off. you might get a better feel of the columation if you back out the drawtube then compare distance to each of the mirror clips

[Charic]

http://stargazerslounge.com/topic/197640-collimation-and-star-hopping/

No matter which guide you read, spend time and more time,  reading and understanding the task, look at it,  look again, visualise it, then try it. 

The day my Skyliner arrived, I needed to correct an alignment problem with the collar at one end of the tube, however, I totally dismantled the whole scope, then re-built it.

It works how it should, and once you understand how everything in the scope works, it becomes very easy.

Unfortunately, looking at  photo images  is not the best situation for us. We would all love to visit and help, but distances wont allow.

[Dom1961]

I've now used my laser to align the primary with the secondary and it looks a lot better now.

[Charic]

.......If it looks good, leave it  and try it.

I suggest Polaris, although not the brightest Star,  it does not move across the field of view when checking?

Allow the scope to cool to ambient, and  that you have good seeing conditions ie. Stars not twinkling when viewed with naked eyes?

Use a small focal length eyepiece, high magnification, and de-focus the image. You should see a series of concentric circles ( the Airy disk) if this is tidy and looks concentric, you wont get much better!

[Gutross]

that looks ready for final adjustments outside under the stars!

much better!

[dweller25]

Yes that looks good now.....

[Moonshane]

Much better

any further improvement will have debatable improvement on the views.