Aloha Rob, I would like to get one, if that's the kind that is sort of spiky. I made a cheapo mask out of cardboard that helps somewhat -- just three holes in it, and when the star images merge it's focused. But it's hard to use. Best wishes, Joe --- On Sun, 6/20/10, Rob Ratkowski Photography <ratkwski@hawaii.rr.com> wrote: From: Rob Ratkowski Photography <ratkwski@hawaii.rr.com> Subject: Re: [Utah-astronomy] New pic To: "Utah Astronomy" <utah-astronomy@mailman.xmission.com> Date: Sunday, June 20, 2010, 8:04 PM Hi Joe are you using a Hartmann mask to focus?? I know getting good focus w/ sct's is a tough project and it takes lots of work to get images that are stunning most of the astro-images that are spectacular tend to be from dedicated imaging gear or refractors (read money) bottom line Have Fun Aloha Rob _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com