Good advice. Myself I have never encounter a bear in the wilderness but the advice of the 400-600mm ++ lenses might be adequate if you could run VERY fast. The wilderness photograph opportunities are quite abundant when travelling in the backcountry in B.C. but many people do not have a firm grasp on reality. My favorite lenses out in the country is a 500mm mirror with 2x or else my 400mm on a A body Canon. Probably with a fast film too. But you must use the proper film and lens so that you get a good bokeh in the frame when the bear is attacking you ;o) ...