I will try!
As with a film camera, the shutter speed, film speed, and aperature all interact to give you the exposure and effect you want. Faster film speeds, for example, allow the photographer to stop fast action or hand-hold a camera for a low-light exposure that might not be possible without a tripod and a slower speed film. Faster film speed sacrifices sharpness, and with digital, increases "noise" on most cameras.
The same film speed rules or guidelines apply with a digital camera as they do with a traditional film camera. Most digital cameras will limit the film speeds you can use. For example, my Canon D30 digital SLR allows for 100 ISO up to 1600. For the figure model shoots I have been doing lately, I always try to shoot with 100 ISO to get the best quality image. I like to hand-hold the camera with some models because they move around a lot, but if there isn't enough light for 100 ISO, I will use either 200 or 400 ISO to allow me to hand-hold and use the aperatures and shutter speeds I want.
Did this make sense? I hope it helps.
A.J.
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