That's a fabulous image. That's the best I have seen the globular cluster in any image. It came out like a pile of pearls.
Just out of interest I see a double set of diffraction spikes which I once got in an image with a Tak BRC250. I got several comments about it meaning collimation was out. But I checked it and it wasn't.
What I concluded and what I have seen since is that its showing a double star where the stars are close together.
Greg.
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