Quote Originally Posted by poiuyt
What does ISO do anyway?

MJAH, you mentioned you have a canon SD450. I have the SD550. Can you please post the settings you have your cam at when you take those amazing bud shots?
A rating of a film's sensitivity to light. Though digital cameras don't use film, they have adopted the same rating system for describing the sensitivity of the camera's imaging sensor. Digital cameras often include a control for adjusting the ISO speed; some will adjust it automatically depending on the lighting conditions, adjusting it upwards as the available light dims. Generally, as ISO speed climbs, image quality drops.
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