Does anyone out there use Leica or other brand rangefinders with both eyes open? I've been reading about this technique and am feeling handicapped by not being able to utilize it. I am left eye dominant; I view and compose through the viewfinder with my left eye. This puts my right eye directly behind my thumb on a Leica, and I usually close it, since it's nearly useless in that position. I've tried looking through the rangefinder with my right eye and keeping my left eye open to see the surrounding environment, but it gives me a raging headache after 30 seconds, and I can barely focus. My left-eye dominance has never bothered me before, but for the first time I'm seeing it as a handicap. Do most right-eye dominant people keep both eyes open during shooting?