Back over at another forum there was this helicopter picture posted. http://www.airforce.ru/photogallery/dundin/kuznetsov2004/bpk/page_07.htm Could anyone explain, Why do two rotor blades seem bent? In reality they are absolutely straight even when in motion. It is a photographic phenomenon, but what causes it? I know something about optics and slow shutter speeds, but this phenomenon puzzles me. Other pictures show the moving rotor blades just fuzzy, like you'd rather expect: http://www.airforce.ru/photogallery/dundin/kuznetsov2004/bpk/page_12.htm (I didn't get the images linked directly, so there are just the links, sorry.) Any reasonable explanation out there?