Thanks, I wasn't expecting such round stars, it was a "let's try a 10min..." after running a 50 frames at 180sec each.
If tomorrow I get a similar night, I will attempt a 15/20/25 min etc... to see when the star trails arrive
I'm impressed by the rounded stars... Excellent image... Can you please advise more about your telescope and its configuration? what do you use for field flattener to get peripheral stars rounded as the central ones? Also, can you describe the light pollution in your location and observation conditions?