[Placidus (Mike and Trish)]

Lovely detail in the main galaxy and in the three tiny ones above it. Very nicely acquired and processed. Very sharp.

Some tiny things that might make it even better:

- There are some repeated hot pixels. Since their position changes strongly with reframing between subs (a very good thing), and you have 15 subs, statistical data rejection (the simplest is median combine; we use a winsorized sample which is more powerful) will get rid of them very easily.

- There are some black spots which are due to hot pixels in the darks. These go away if you use statistical rejection when making your master dark.

- There are some dark haloes around the brightest stars produced by deconvolution or sharpening. There are many "anti-ringing" tricks for controlling these.

- There seems to be some misregistration due perhaps to changes in focal length and other higher order distortions between frames. A simple shift and rotate won't get rid of these. You might need more sophisticated registration software.

Once again a lovely image.

Very best,
Mike