Chuck, The autoguider doesn't negate the need for PEC; the autoguider improves the tracking beyond what PEC can. You can use an autoguider function with the main telescope, rather than the guide scope, for PEC training. I think it's better not to use the guide scope for training because there's always the possibility of a little flexture between the two scopes. Best wishes, Joe ________________________________ From: Chuck Hards <chuck.hards@gmail.com> To: Utah Astronomy <utah-astronomy@mailman.xmission.com> Sent: Wednesday, December 14, 2011 8:41 AM Subject: [Utah-astronomy] Imaging question Can an autoguider be used to train the mount's PEC function? Or does the autoguider negate the need to use PEC? Thanks! _______________________________________________ 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