Mjduct-I was concerned about the "rolling ball effect" as I have always been very susceptible to motion sickness. However, I've spent many hours over several years panning lots of western landscape on elk hunts using a Swaro10x42 EL. No problems whatsoever. I know little about the technical aspects of optics and continue to wonder if this effect is real or something that has been played up and exaggerated by Internet optical experts.
