square stars ?

[mgirdwood]

Hi

having been away from the telescope for a few years i am trying to get back into imaging.  spent the last few nights trying to grab some images of M33 as its one of the better targets available to me.

only a few subs taken to test the rig but i notice that i seem to have either square looking stars or very intense stars. i have noticed similar on my TS 65 Quad so i am assuming i need to look outside the scopes themselves.  i know how frustrating it can be to try to get everything working together so any pointers would be appreciated 

 

Thanks, Mark

 7x180sec RGB no lum  -  quick DBE and stretch in Pixinsight

Atik 314L Skywatcher ED 80 with reducer. Bart mask for focus PHD2 guiding ( although not so good as need to drift align) HEQ5