Odd star shape.

[Perrywarburton]

2 minutes ago, knobby said:

Could it be tilt ? He camera is a long way from focuser ? Plenty of scope for tilt.

Maybe try a star at the zenith to test ?

Thanks for the reply. It’s not too far from the focuser. Only about 100mm. 
 

I’ll take an image now and upload it straight away. 

[Perrywarburton]

14 minutes ago, knobby said:

Could it be tilt ? He camera is a long way from focuser ? Plenty of scope for tilt.

Maybe try a star at the zenith to test ?

Here is an image of HIP 50079

[knobby]

Blimey, running out of ideas ...

CCD inspector might show something but it's a paid app.

ASTAP does something similar and is free. Her is your jpeg, migh show more info from a fits ?