Jim: The triangles make diffraction spikes that make it easier to find focus. DT --- On Sun, 3/1/09, Jim Gibson <jimgibson00@yahoo.com> wrote:
From: Jim Gibson <jimgibson00@yahoo.com> Subject: Re: [Utah-astronomy] Harmon’s Aids Armature Astronomer Develop Hi-Tech Equipment To: "Utah Astronomy" <utah-astronomy@mailman.xmission.com> Date: Sunday, March 1, 2009, 3:17 PM Cool Daniel, How do the triangles work instead of the circles? I have some naugahyde left over from a project. I think I will use some of that and make 3 tools; a focus mask, a flate field deal, and a cross for diffraction spikes. Just slip them on and there you go. Jim
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