It's in his book The Dobsonian Telescope: A Practical Manual for Building Large Aperture Telescopes by David Kriege and Richard Berry, available from Willmann-Bell. He has a page that you can xerox that has a master template good for several sizes of diagonals. There is also a table that gives the proper offset. Make sure you offset in the right direction, it isn't obvious. Clear Skies Don Colton -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com]On Behalf Of Jim Gibson Sent: Tuesday, August 12, 2003 1:52 PM To: Visit http://www.utahastronomy.com for the photo gallery. Subject: RE: [Utah-astronomy] Lasers and collimation questions Don You mentioned: Dave Kriege's template How do I get such a template? Jim ---------------------------------------------------------------------------- -- Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software