HP photosmart R725 User Manual page 23

Lower ISO speeds capture images with the least amount of grain (or noise), but result in
slower shutter speeds. If taking a picture in low light conditions without a flash at ISO
100, use a tripod.
Higher ISO numbers allow faster shutter speeds, and can be used when taking pictures
in dark areas without a flash, or when taking pictures of fast moving objects. Higher ISO
speeds produce pictures with more grain (or noise) and, therefore, can be of lower quality.
HP Photosmart R725/R727 Digital Camera 23
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