Here's one I took at BSG on Thursday night with a QHY8 and a SMC Pentax-M 100mm lens two stops down.
There's a bigger field
here [4.3MB | 2128px wide]
and a smaller version
here [2.5MB | 1600px wide]
First night was unsuccessful as the fog rolled in around 3:00am but the second night stayed clear and relatively dry way past sunrise so I managed 45x180s on it.
Still fairly low but the skies were pretty dark pointing north and I really wanted to have a crack at it so I'll make sure I reshoot it at the zenith when it's the season. Probably with something a tad wider too.
This shot had a lot of gradients to deal with due to low altitude and I'm surprised it still turned out sort of alright.