Best camera lenses for ethical blue whale and wildlife photography

Blue whales are absolutely massive, so even at 100 meters, a 70-200mm lens will give you decent environmental shots. However, if you want detailed shots of the dorsal fin or tail flukes when they dive, you will want a 100-400mm lens. Do not bother bringing a tripod; the boat rocks too much. Use a fast shutter speed (1/1000s or higher).