Today the sky cleared up pretty well, and I was able to get some more exposures with the Polarie:
37 x 30s, f/3.2, ISO 1600, Nikon AF Nikkor 180mm, Nikon D7000:
The bright moon created a gradient which I didn’t even try to get rid off. At f/3.2 the 180mm shows much bigger stars than at f/4, next time I will try f/3.8.
With 37 exposures (~ 18min total exposure) even some weak h-alpha emission becomes visible, this crop from the image above shows the horsehead as well as the flame nebula:
Yesterday’s test had sharper images, but with more exposure, more detail in the “running man” nebula above the Orion nebula becomes visible: