Ideally, a hydrogen fuel-cell vehicle has no environmental impact. Energy is produced by combining hydrogen with oxygen pulled from the atmosphere, and the tailpipe emission is water. The hydrogen fuel could come from a number of sources (Iceland recently started pulling it out of the ground).
A fast shutter speed such as 1/400th of a second will produce a series of crisp frames that have a choppy look when played back. A slow shutter speed such as 1/30th of a second, on the other hand, will produce a series of slightly blurred frames that have a smoother look when played back.
Understanding the Shutter Speed. Traditionally, still camera shutter speeds are expressed in âsecondsâ, at fixed intervals. The difference between the shutter speed and amount of light is directly linear; which means, double the speed, double the light â or half the speed, half the light. Here are the standard shutter speeds youâll find on most professional cameras (in seconds):