ISO numbers reflect the film speeds we used before digital, they almost double at each step.
Shutter speed is linked to aperture and maybe set automatically, you have to have the correct amount of light hit the CCD or film to make the picture, not enough=too dark, too much=too bright, small aperture=slow shutter and large aperture =faster shutter. (shutter speeds double each step, aperture the same, figures just look as if they don’t).
So we are able to juggle between aperture – car in focus/background out, and speed, car sharp or blurred, moved while the shutter was open.
A higher iso number should allow for a faster shutter speed, there must be a drawback to this?, and you may be able to chose between aperture and shutter priority and keep the shutter fast at the expense of aperture (large aperture = less area in focus, small aperture=focus from the tip of your nose to the horizon)
You may be able to switch to full manual mode and set the shutter as you like.
Telling us what model the camera is, this may produce better replies.
Understanding some of this may make taking pictures more interesting, great thing with digital, you can play and see whats happening and the only cost is your time.
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