Last night I accidentally slewed during an exposure and it gave me an idea.
I'm sure you guys have already mastered this, but here's my attempt at a single 15 min slewed exposure. PinWhirlRing? Ringy PinPool?
Exposure times were 8 min Pinwheel, 4 min Whirlpool, 1 min Ring
I keep my computer in the house so the other 2 minutes were spent running around like a madman with a lens cap, while impatiently cursing Stellarium and PHD2. I actually broke a sweat!
In retrospect, I suppose I could have done a 20 min exposure and added more lens cap time to take the pressure off but what fun would that be?