curtismacc I have no problem with 75% stacking efficiency, I also consider that the best you could expect. I do have a problem with less then 50% efficiency, especially in mosaic mode. For me mosaic efficiency starts at less then 50% and goes downhill from there, the longer you wait, the smaller it gets. I have never seen the effective mosaic exposure time go beyond 110 minutes, no matter how long the total exposure is. After wasting many nights on mosaics with nothing to show for it, I have completely given up on it. As far as I am concerned, this feature does not work and I am using the planning feature instead to acquire the data and then doing my own mosaics with third party tools.
