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.
1 If the focal length is 50mm, then, the minimum shutter speed would 1/50s (1/60s). ( 2 not the corrected focal length for the sensor size). 3  For the focal length of 250mm, then, the minimum shutter speed would be 1/250s. 4  Adapting this guide to modern DSLRs with sensors that are smaller than full frame sensors.