Thankyou for your help guys,
I have never had any problems with PHD before so I am hoping it is a one off problem.
I am pretty thorough with balancing and polar alignment so I am positive that is not what is causing it. Whenever I setup I always balance the scope in both RA and DEC axis before proceding. I then spend an hour or so drift aligning getting my polar alignment as close as I can before doing any imaging.
I haven't set PEC so I let PHD do the corrections. I always use a 1 second exposure or more depending on the guidestar and seeing conditions and I have the Autoguiding rate set at 0.5x.
I'm not sure what is causing this.
Could it be the settings on the mount or maybe PHD?
