The new 2" Televue paracor works superb with my 18" f/4.3. Stars are pinpoint to the edge. It is used with all eyepieces even high power and is adjustable depending on the eyepiece. With fast optics it is critical to have very accurate collimation see the June 2002 Sky and Telescope. The paracor makes the collimation a tad bit more forgiving. An f/5 scope is more forgiving than a f/4.3, make sure your scope is very accurately collimated before you decide how much you need it. Clear Skies Don Colton -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com]On Behalf Of DunnDave@aol.com Sent: Tuesday, September 16, 2003 11:10 AM To: utah-astronomy@mailman.xmission.com Subject: [Utah-astronomy] Coma Does anyone have any expirience with Coma Correctors? My newly completed 16" f/5 has coma. I would appreciate any advise anyone might have on how to deal with coma. The Lumicon and TelVue correctors are several hundred dollars so I don't want to just buy one to experiment. Thanks. Dave _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy