I was in the arctic in '55, (see my post, page 3 of this thread) and they passed the word that there was a polar bear on an ice flow, so I grabbed my camera and hustled to get pictures of the polar bear. The bear in real life was easy to see, there plain as day, standing on an ice flow, with very little other ice around. I took several pictures, slides, but I didn't have a long lens, just the lens that came with the camera, which was a good one, but not good enough. When the pictures came back, the bear couldn't be seen, not a trace of the bear, no black nose, nothing. And that is when the picture was projected onto a 4 or 5 foot screen, nothing but ice. I was really disappointed, that was the only bear during he entire trip.