So we come to the first hurdle. How does one do this? I am using the previewer but I don't know what are reasonable settings for this.

I point the scope at the sky, the sky is reasonably dark, but I can't capture anything that looks like the sky to focus on. In the attached screenshot you can see my settings and the preview that is not recognizably the sky. What should my settings be to make this initial preview so that I may focus the scope (must be a manual process, on my Celestron Nextstar 4se, no autofccusing available).

Also, I have no idea what the shadows, midtones, and hightights should be set to in the preview window. I don't understand what these controls are for.

Please help this noob!

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