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200P Skyliner collimation pattern


Guest wisewoman
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Guest wisewoman

Hi there,

I have been messing about for ages trying to get perfect concentric rings in my cheshire. I've ended up with something exactly like the image on the right here with the secondary offset slightly and more black shadow showing on the right then the left (hence not perfectly concentric):

http://stargazerslou...dry-quandry.jpg

now I understand that fast scopes naturally end up a bit offset but my 200P is an f6 (1200cm length, 200cm diameter) - should I be able to get perfect concentric rings or not?

Thanks,

Melissa

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Guest Kheldar

Not, f6 is still relatively fast compared to f12 say :)

The beauty of the offset issue, is you don't actually have to worry about it. So long as the steps before are done right, and the crossharis line up with the centre spot, the offset is always right.

I think ... :D

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Guest wisewoman

Right thanks for that Kheldar - I was contemplating trying to fiddle with the focusser housing but I shall leave it for now and star test tonight hoping for perfection!

The board will be hearing from me if it's not! :D:P

Melissa

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This offset used too bother me until, as Mick says, I found out it's naturally in with the secondary.

Edited by Rusty Strings
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