I tried to make HDR with 5 night shots and various exposure times: 15, 8, 4, 2, 1 seconds; F 7.1, ISO 100. But I get disappointing results, really unwatchable.
You really need to give us a bit more info if you want us to give you some advise.
- How did you create your starting point? Did you use Hugin, darktable’s create HDR functionality, Luminance HDR or …
- What process did you follow?
- Can you post that (unedited) starting point?
- What is your posted histogram supposed to tell us?
Only telling us that you get disappointing, unwatchable results doesn’t tell us anything. Well, it does: You’re not happy 
Help us to help you.
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