The Blug points toward opening of the scope not toward the mirror, so you can easily see it. But to be safe it is best to have it screw into the Barlow so it doesn't fall into the tube and land on the mirror see http://www.kendrickastro.com/astro/laser.html#BarlowedCollimator -----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 2:12 PM To: Utah Astronomy Subject: Re: [Utah-astronomy] Laser collimator Thanks, Dave. I'm thinking of the Blug, which is installed on the inside of the focuser. With that arraingement, you can't see it in a closed tube unless looking at it's reflection in the primary. I do like Glatter's green laser option, for collimating in daylight. Even more pricey, however. Also I can't wait to try a laser collimator on my binocular viewer attachment- see just how parallel those two optical trains actually are. On Tue, Apr 22, 2008 at 1:02 PM, Dunn, Dave <David.Dunn@supervalu.com> wrote:
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.
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