Re: Veil Question

From: Uncle Bob (realonespam_at_bogusnet.net)
Date: 11/30/04 

Date: 30 Nov 2004 05:47:10 GMT

Doink wrote:
> Greetings....
>
> I recently---before the moon's light burned things out---viewed the Veil
> with the 13" Coulter I bought recently. It was reasy to find and pretty
> bright but not very resolved. When I've seen it in the past with my 8"
> reflector, I could a lot more detail and structure. In the Coulter it
> looked more like smoke. I am using a OIII filter.
>
> Is this the optics of the Coulter or the seeing? I should have done a same
> night comparison...will have to wait for that.
>
> Regards,
>
> Doink!
>
>

If you know the Coulter's mirror to be good, then you've likely got
collimation issues. Is the focuser square with the tube? (Use a laser
and measure the distance from the end of the tube to the laser spot,
then from tube end to laser output point).
They must agree for a normal newtonian. Then stretch a tape measure
across the inside of the tube and see if the laser hits at the halfway
mark. It should.
Once that's adjusted, use a barlowed laser. The reinforcing ring center
marker will cast a shadow around the laser output port on the return
trip. If the shadow is centered around the ring, you're there.
Try a star test before and after your precision collimation and you'll
see a big difference, I bet.
Good luck man.
Two scopes! You got the bug.
Uncle Bob

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