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Originally Posted by Kimberly Dow
Another stupid question Mike -
When you say 1/30 of a second - that would be an ISO of 30? So when you say 1/200 for kids that would be the 200 ISO setting - correct?
That scares me since in those Barbie shots I didn't get anything decent under 800. And she wasn't moving. Maybe too much coffee.
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No my dear. Shutter speed (1/30 th of a second) is totally separate from the ISO number. You can influence SS by changing the ISO, but you cannot influence ISO by changing the SS.
ISO's will range from 100 to 1600 on your camera. Remember when you bought a roll of film? You had several choices of what was called "film speed." That was actually the ISO setting. The ISO definition gets slightly convoluted when going from film to digital, but you could think of it as film speed.
Try this -- without actually taking a picture, set your ISO to 100 and find something specific to point at. Notice the exposure in the viewfinder. You will see two numbers -- the SS and the aperture. It might read: 1/125 ... 5.6. Make note of the one on the left, this is the SS.
Now change the ISO to 400 and point at precisely the same spot. Notice that the SS has increased by a pretty good margin. This is the number you want to monitor. You want to get this number into the 1/125 range with the minimum increase of ISO. At this kind of SS you can stop the movement of most folks in pose. It might not freeze a person running the 100 dash, but that's another story. It's amazing that the SS can go all the way to 1/8000 th of a second. This sort of speed can almost stop a speeding bullet.