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).
4) Fast, Slow and Long Shutter Speeds. Fast shutter speed is typically whatever it takes to freeze action. For me, it is typically above 1/500th of a second for general photography and above 1/1000th of a second for bird photography. NIKON D700 @ 420mm, ISO 450, 1/2000, f/5.6.
When you play back the movies made at those speeds at the camerasâ regular playback speed of 30 fps, youâve got yourself a slow motion movie. And thatâs basically it for slo-mo: film at a higher rate, play back at the normal rate and youâll be seeing all the extra frames that account for the slow motion appearance.