No not with the Barlow. The laser passing through the Barlow makes a large red glow that is hard to see through. What I do is first center the dot on the primary and back into the laser watching the primary mirror (with someone turning the knobs). Then I put the Barlow on and watch from the side. I can see the end of the collimator in the focus tube directly on my 10 and 16 inch scopes. I watch until the center circle is centered around the laser. I will take a look and see if I can see it on the 8" at the star party that I have this Thursday. It is an f/7 so I don't normally need to be that precise. The Glatter model that I have was bought in around 2000 and is the model that works in both 2" and 1.25" focusers. The 1.25" part of it makes it longer. I think that if it didn't have the part, it would be hard to see. Dave -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Chuck Hards Sent: Tuesday, April 22, 2008 12:03 PM To: Utah Astronomy Subject: Re: [Utah-astronomy] Laser collimator So, Dave, are you watching the reflection in the primary? On Tue, Apr 22, 2008 at 9:26 AM, Dunn, Dave <David.Dunn@supervalu.com> wrote:
I use one all the time on my closed tube Dobs. I can see the collimator in the focuser from the front of the tube. My Glatter collimator is about 4 inches long so it comes all the way to the end of the focus tube.
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