Tip of the Day: Extreme Photo

Some of the best pictures are born of the worst conditions. Here are some ways to get rewarding photos in challenging situations.• From the air: The main technical challenge is vibration, so set a fast shutter speed and use a normal or telephoto lens with image stabilization. Also, propellers often show up in photos, even when their spinning keeps you from seeing them when you look out the window.• Underwater: Water absorbs light selectively, appearing greener near the surface and more blue deep