Dear Mr. Schweitzer, I am using a Schmidt-Cassegrain-telescope too and at the age of 57, no more one of the youngest observers. I use an erecting-prism or -mirror. Very comfortable when observing stars near, or in the zenit! -- Georg Comello | Tel. : (31)-50-3634050 Kapteyn Laboratorium | Fax : (31)-50-3636100 University of Groningen | E-mail: comello@astro.rug.nl P.O. Box 800, 9700 AV Groningen | The Netherlands |