ISO Photography

ISO Photography - By definition the ISO is a measure of the sensitivity level of the camera's sensors to light. The higher our ISO setting the more sensitive the sensor to the light.

To get a clear picture of the ISO setting in our camera (ASA in case of film photography), try to imagine a bee community.

• An ISO is a worker's bee. If my camera is set at ISO 100, that means I have 100 worker bees.
• And if my camera is set at ISO 200 it means I have 200 worker bees.
  

The job of every worker bee is to pick up the light coming through the camera lens and make the image. If we use identical lenses and aperture we both set in f / 3.5 but I set ISO at 200 while you 100 (think again about the worker bees), then the image has anyone who will finish faster?Understanding-ISO-photographyOutline:

• When we add the ISO setting from 100 to 200 (in constantly constant aperture - we key the aperture in f / 3.5 or via Aperture Priority mode - A or Av), we shorten the time taken in making a photo in our camera sensor to half 2 times faster), from shutter speed 1/125 to 1/250 sec.
• When we add another ISO to 400, we cut the photo creation time by half again: 1/500 seconds.
• Each time we shorten the escalation time by half, we call an increase of 1 stop escosur.
  

You can try this understanding in the case of aperture, try our constant shutter speed set at 1/125 (or through Shutter Priority - S or Tv mode), and change your ISO setting in multiples of 2; Eg from 100 to 200 to 400 ... etc, see the change in your aperture size.