M13 is 22400 light years from Earth, has a diameter of approximately 150 light years and is the brightest globular cluster in the northern sky.

As the second target tonight, I chose M13. Because I had big problems with guiding at my Deep Sky premiere two weeks earlier, I wanted to try shorter exposure times that night to gain more experience. M13 as a globular cluster has a relatively high brightness, so 100 subframes with 60 seconds exposure time and a gain of 180 should be sufficient.

The fact that the night was bright because of the full moon didn't help me choose shorter exposure times ... hahaha

For my first target that night (Pinwheel Galaxy) I chose the same settings, so that I only had to create darks bias and flat frames for both sequences once. This time I was optimistic that all sequences would go through without interruption. When planning, I again did not consider that with the current constellation of my targets a meridian flip was inevitable, in which, as expected, the guide star was lost again.

This shows that I'm still quite a greenhorn when it comes to deep sky photography.

For the first time I used the freeware Regim during processing to level the background gradient and in particular to carry out an automatic B-V color calibration of the stars. I had previously stacked 77 out of 100 frames with DeepSkyStacker. After the color calibration, the picture was roughly stretched with Fitswork4. I did the denoising with Topaz Denoise AI, which I am currently trying out in the test version and which I like very much both from the user interface and from the final results. I did the final image editing with Lightroom to do one last stretch and to increase the contrast and the color saturation.

The result is so far ok for me, whereby I would have liked more details and finer graded colors. Maybe I expect too much from my uncooled color camera.

As always, I look forward to your recommendations and harsh criticism to improve my skills.