Understand the concept of ISO

Understand the concept of ISO

By the definition of ISO is a measure of the sensitivity of the camera sensor to light. The higher the ISO setting the more sensitive we terhada light sensor.
To get a clear picture of the ISO setting on our camera (ASA in the case of photographic film), just think about a community of bees. An ISO is a worker bee. If my camera set at ISO 100, it means I have 100 worker bees. And if my camera set at ISO 200 which means I have 200 worker bees.


Is the duty of every worker bees collect the light coming through the lens of the camera and make pictures. If we use the lens aperture is identical and we both set at f/3.5, but I set my ISO at 200 while your 100 (think again about the worker bees), then the picture who is going to have a faster finish?

Broadly speaking, when we increase the ISO setting from 100 to 200 (the aperture is always constant - we lock the aperture at f/3.5 Aperture Priority mode or through - A or Av), we shorten the time required in making a picture in the camera sensor we are up to half (2kali faster), shutter speed of 1/125 to 1/250 sec. As we add more ISO to 400, we cut back to half again making pictures: 1/500 sec. Every time esksposur shorten as much as half, we call for 1stop esksposur raise.