Understand the concept of ISO on the camera, in the definition of ISO is
a measure of the level of the camera sensor to light sensitive. The
higher the ISO setting the more sensitive we to sensor 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?
Outline:
- When we add 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 sec.
- As we add more ISO to 400, we trim the time making up half the photos again: 1/500 sec. Each time - The eksposure shorten the time by as much as half, we call the raise eksposure 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; Missal from 100 to 200 to 400 ... etc, see change your aperture magnitudes.