Last month (September 2021) I spent a couple of weeks in the mountains, in order to make sure that I didn't bring home the pandemic to my parents. This gave me the opportunity to take more photos than usual. I tried taking pictures of the moon, but despite having a tripod and a telephoto lens the results were not as good as I hoped.
In order to try and improve the image quality I googled around, and I read about Pixel Stacking. The following two images are the result of an 8-picture stack, and a single sharpened photo. Can you spot the difference?
Hint: look at the filenames.