What is ISO ?

It's the sensitivity setting for the sensor in your camera.

Rated by ISO:

  • ISO 100 = less sensitive to light.
  • ISO 800 = more sensitive to light.
Related: Aperture, Shutter Speed.
  • Low ISO 100 = requires more light, larger aperture, lower shutter speed, less noise in photo.
  • High ISO 800 = requires less light, smaller aperture, higher shutter speed, more noise in photo.

    Noise / Grain Effect dpstudent.blogspot.com
    Low ISO 100, less noise,
    less grain.
    High ISO 800, more noise,
    more grain.
In short:
  • Go for lowest ISO possible, unless you want the grain effect.



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