Howdy Ken.... I use an 8" Celestron HD for imaging (compare to your 10"), and an SBig ST8300m. In that configuration, I use a Meade 80mm (f7.5) for guiding, using a Starlight Express Lodestar X2 guide camera. The match up (FOV) is very comparable (big chip size difference)... and the guiding is excellent. See my setup on my main astronomy page: http://www.az-dahut.net Hope that helps..... David M. Douglass dmdouglass@xxxxxxxxxxxxxxx (secondary) david@xxxxxxxxxxxxxxx (main) Cell (602) 908-9092 -----Original Message----- From: az-observing-bounce@xxxxxxxxxxxxx [mailto:az-observing-bounce@xxxxxxxxxxxxx] On Behalf Of KenGSikes Sent: Tuesday, September 2, 2014 5:22 PM To: SAC Mail List; EVAC; AZ Observing List Subject: [AZ-Observing] Orion ED 80 f/7.5 Has anyone had any experience using the Orion ED 80 f/7.5 as a guide scope on a 10" SCT ? Any advise would be welcome Ken Sikes -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list. -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.