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.
Mode (Tv). In this AE mode you set the shutter speed (time) by rotating the main dial located next to the shutter release button. The camera will then automatically set an appropriate lens aperture for you. Tv stands for âTime value.â Use this mode if specifying the shutter speed is important. For example, you may want a fast shutter speed to freeze motion or a slow shutter speed to blur it.