The OM's had a reputation for being the most quiet and vibration free of any 35mm SLR, and my experience with them bears this out. But they certainly don't compare to the tinny click of a rangefinder or viewfinder shutter. But as for vibration, I find them much less vibration prone than my rangefinders. The shutter release is very smooth and consistent; I regularly handhold my OM's with a 28-35mm lens at 1/15, 1/8 and even 1/4 with very good results. By the time you fight the stiff shutter release, trap the meter and set the exposure on a RF, you're lucky if 1/60 - 1/120 doesn't show some camera shake.