Exposure: ISO (DIN*, ASA)

• ISO: The number indicating the camera sensors sensitivity to light. The higher the sensitivity, the less light is needed to make an exposure. However, the more ISO more noise. Noise: Randomly-spaced speckles (pixels) that can appear in digital images shot at high ISO numbers. Noise results in a reduction of photo detail and clarity, though it can be reduced with special noise reduction software.
  
• ISO Speed The emulsion speed (sensitivity) of the film as determined by the standards of the International Standards Organization. In these standards, both arithmetic (ASA) and logarithmic (DIN) speed values are expressed in a single ISO term.
  
• The value of ISO is depend on situation for digital camera:
  100-200 in the place that have normal light or in bright light
  400 in the place that not so bright may be a little dark or in the shadow
  800 up in the dark place
  And more ISO make more noise so we suggest that use in low ISo will be better in quality however, use low ISO need lower speed shutter which is using the tripod for the camera is needed. I suggest to use 100-200 for the good quality of your picture :) .


• More detail about noise: Noise is most visible when photos are shot at ISO 200 and above with a consumer digital camera. Some digital cameras have a Super CCD where photos taken at higher ISO numbers (eg. ISO 1600) have little, if any, visible noise.