I took this photo while in Alaska with my wife. After a good hour on foot with a experienced guide we finally got very close to this beautiful female. We were about 100 feet away. She was majestic, but most of all very imposing (very hard in this picture to show her scale). She was most likely looking for male while she is keeping a close eye to her little cub as the males are there main danger on a daily basis.
Surprisingly female bears in the region will actually come very close to a photographer if she has to feed or sleep with her cub. She knows that male bears are not getting close to humans, they use us as sheild or baby-sitter if you will ;-) The first time this happens it's a little surprising but needless to say it gives great opportunities for photography.
Equipment used to take those pictures: Canon 5D MarkIII and a 100-400mm or 70-200 2.8 IS lens