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Focuser collimation, Newtonian

Tea drinker · 2009-06-10 19:53:19

Hi folks, I think my focusser collimation is off. When my focuser is racked out the secondary looks nice and concentric, but as I move it in it appears to become non concentric. I think maybe it is still non concemtric while racked out but it just doesn't appear so That's got to be focuser? Not secondary position? But…

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10-06-2009 8:53pm

#1

Tea drinker

Registered Users Posts: 2,818 ✭✭✭

Join Date: March 2003

Posts: 2674

Hi folks, I think my focusser collimation is off.
When my focuser is racked out the secondary looks nice and concentric, but as I move it in it appears to become non concentric. I think maybe it is still non concemtric while racked out but it just doesn't appear so

That's got to be focuser? Not secondary position? But maybe it could be...

Thanks for any advice....

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#2 15-06-2009 11:48pm
Tea drinker

Registered Users Posts: 2,818 ✭✭✭

Join Date: March 2003

Posts: 2674

I got it perfectly collimated, used a sight tube and autocollimator.
I tweaked the focuser a little bit, but mostly secondary and primary needed attention.

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