While #2 might be true in our case, the manual says that evenly spaced EV is unnecessary. What is is providing enough relevant data for enfuse to ingest. In fact, if I have trouble with the highlights, I could list the images with the highlight data more than once to boost their weights. In combination with alpha masking, this tactic is very powerful indeed. And so, as I have said numerous times, enfuse has a lot of depth if one is willing to go beyond the defaults. I am just a beginner myself. 