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. 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 8:50 AM To: Utah Astronomy Subject: Re: [Utah-astronomy] Laser collimator Kurt, it seems to me that you can't use the Blug on a closed-tube Newtonian, since you can't see it. Am I off the mark here? On Mon, Apr 21, 2008 at 1:33 PM, Canopus56 <canopus56@yahoo.com> wrote:
In addition to Glatter's collimator, I also recommend Glatter's blug, if you are collimating a fast Newt. It greatly simplifies the laser collimation process for planar holographic alignment.
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