[raymo]

Hi again Andrew. Firstly, your pic is huge. I had to reduce the screen
mag on my laptop to 24% to get the whole pic. At that mag the star trailing disappears. A 30 sec exposure should show a lot of detail, so I'm guessing that you have the lens stopped down to it's minimum aperture. Try it with the lens one stop down from wide open. If it's max is f/ 3.5, set it to f/4. I assume that you have the camera on manual, setting the aperture and
shutter speed yourself. What ISO setting were you using? ISO 800 is a good starting point. I suggest that you leave stacking for now. Get your basic astro imaging working reliably before moving on to the next step. I have no idea of your level of expertise with a camera, so forgive me if I am trying to teach grandma to suck eggs.
raymo