hi guys and thanks for all your feedback, However My 72ed is a TS-Optics Photoline 72ED. I suppose I should have opened with that Info !!
I think I may have found the problem, The flattener that I have doesn't appear to be compatible with my Scope. being it is only 400mm focal length. So I have ordered a Orion Flattener for short tube refractor's and fingers crossed it will be the answer to a nice wide flat field.
Cheers Ice..
