does an accessory viewfinder provide a meter display, focusing crosshair, distance readout, iso and exposure compensation settings, illuminated framelines, parallax- and field-size correction, or a flash ready signal? if you weather seal the entire camera, you weather seal the entire camera. and image stabilization is useful even on a wide normal, and not just for slow shutter speeds. it lowers camera shake induced softness up to at least two stops faster than the reciprocal of the focal length. so the shots you take at 1/125+ will even have more contrast in fine detail. this is much more important in digital capture, btw.