[Carl]

My stars are streaking at the edge of my images. I am using a Celestron C8 with a 6.3 focal reducer, mounted on EQ6 mount on permenant peir.
I have re aligned my scope 3 times (Test result: able to keep star within centre of cross hairs of illuminated reticle for over 10 minutes).
What is going wrong?
How do i get a flat field out to the edge

Regards
Carl