By definition the ISO is a measure of the level of the camera sensor to light sensitivity. The higher the ISO setting the more sensitive we sensor to light.
To get a clear picture of our camera's ISO setting (ASA in the case of photographic film), just imagine about a bee community.
An ISO is a worker bees. If I set my camera at ISO 100, meaning I have 100 worker bees. And if I set the camera at ISO 200 it means I have 200 worker bees.
The task of each worker bees are picking up the light entering through the lens of a camera and make a picture. If we use an identical lens and aperture equally we set at f/3.5 but I set the ISO at 200 while you 100 (think again about the worker bees), then the image got who will finish more quickly?
understanding-ISO-photography
Outline:
When we add the ISO setting of 100 to 200 (in the ever constant aperture – aperture in the key us f/3.5 or through the Aperture Priority mode – A or Av), we shorten the time required in the making of a photograph in the camera sensor we get half (2 times faster), from shutter speed 1/125 to 1/250 of a second.
As we add more ISO to 400, we trim the time making up half the photos again: 1/500 sec.
Each time the exposure shorten the time by as much as half, we call the raise exposure by 1 stop.
You could try this sense in the case of aperture, shutter speed set we try always constant at 1/125 (or Shutter Priority modes – via S or Tv), and change your ISO setting in multiples of 2; Example from 100 to 200 to 400 ... etc, see change your aperture magnitudes.
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