I picked up an iOptron Skyguider Pro with the new iPolar alignment scope. Once I have a proper polar alignment, I can then take long shutter images of the sky. The shutter length has been set to a max of 10-seconds and high ISO (5000). Using the Skyguider I’ll be able to track the sky and take much longer shutter images in the neighborhood of 5-minutes at lower ISO. With a medium format camera!
I am now shooting between 10 and 20-plus files as well as at least 2-black or noise files (taken with lens cap on at time of shooting). The noise capture must be taken at the time you shoot in order to maintain the same temperatures of both the location and sensor; I’ll normally capture one at the beginning and one at the end.