Hi Dennis,
I have successfully used my DMK21AU04.AS for long exposure imaging. The DMK has an exposure limit of 60 minutes so will have no problems with it. All you have to do set the exposure time in IC Capture to whatever exposure time you require and it will do the rest.
What is does is save all your long exposures into a video file that you will need to seperate with VitualDub for stacking later.
