Well. First time out for ages and I spent an hour and a half sorting the collimation out and then set off an overnight ACP run. Nearly every frame was scrap largely due to it failing to find a guide star - (cloudy I think). However, the first two were OK and yet I STILL have this oval star issue - (I have removed the lens from the AO unit to see if it was affecting star shape). I am beginning to think that is MUST be a guiding issue in some way - really racking my brains on this. Talk about going round in circles.......or ovals!