-ISO (International Standards Organisation) rating
-Subject lighting
-Subject reflectance
-Personal preferance
Doubling of the ISO rating = Double the sensitivity
Eg. ISO200 requires 1/125 @ f8
ISO400 requires 1/250 @ f8 or 1/125 @ f11
High ISO = image degeneration / grain(film) / noise(digital)
Rule of thumb = use the lowest possible ISO in a situation
To prevent camera shake, use a shutter speed that is at least double the value of the focal length.
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