jmrp

Lee - it can be done - if you are intent on cutting the F10 tube you can get an F5 telescope using the following information and a commercially available 0.5x focal reducer on the focuser tube end: D80F10 to D80F5 this is just one example - cut 100mm off tube if this does not work for you - you can use a 100mm extension tube at the focuser (no focal reducer) to restore original focal length Focal Length Objective 800mm Focal Length Reducer(FR) 200mm FR dist behind objective lens 600mm Back Focal Length 100mm Effective Focal Length 400mm Total Length 700mm Bob

A manual GoTo was described using the values for RA/Dec https://www.dpreview.com/forums/thread/4363903 Alternatively I have done a similar GoTo using the Hour Angle (HA) Circle settings and a graduated setting circle on the Dec bracket - I then use the HA Stellarium value for any DSO