Nice cluster Stuart. The core resolves well. Good work.
What happened to the right of the image - looks like a lens flare?
Is it present in all your subs or of a certain filter used?
It's Antares, just out of the FOV. There's another on the bottom (which should be the top as I've forgotten to flip the images). As Antares saturates in less than 0.1second, I thought it best to exclude it from the pics. I actually like the effect, don't know why, just like it.