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Very nice shot.
A couple of tips:
1. Always centre the object before shooting (assuming you want the object centred in the final image) otherwise you will lose some of the field when cropping the final image. So I would suggest cropping this image so the cluster is centred.
2. The background is too black. The sky isn't jet black so when you processed it you cut off part of the low end of the light data to make the background look black but you lost some data doing that as well.
That is called clipping (cutting) the histogram ( a graph of the different brightnesses in an image).
On the other hand you did a lot of things right in this image - focus, tracking, exposure time (the core is resolved).
Greg.
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