Thanx! This wasn't easy because of very heavy wind, even the tripod was not really static. I made more than 11 pictures in this row but could only use 5 of'em. The rest was unsharp.
I did about 11 shots (i guess): 1/4s, 1/2, 1s, 2s, 4s...4m, with 3 grey filters mounted on the lens, made during daylight. Afterwards I blend them over an tonemap them. This is the result of about 4 hours work.
This is also possible with a non-DSLR, but: it means even more work. I did it with Canon Compact & Bridge Cameras too, but the best results I got with "alternative firmware". Yes, I changed the internal programming of the Cameras to do HDR. Not something I would recommend... But it did the job. Way harder & slower...