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Understand The Concept Of ISO

Posted by Learn Photo on Kamis, 10 Desember 2015

By definition the ISO is a measure of the level of the camera sensor to light sensifitas. The higher the ISO setting the more sensitive we terhada 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 my camera set 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:
 
1. 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 of a second.
2. When we add more ISO to 400, we trim the time making up half the photos again: 1/500 sec.
3. Each time the esksposur shorten the time by as much as half, we call the raise esksposur 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 ubah-ubahlah your ISO setting in multiples of 2; Missal from 100 to 200 to 400 ... etc, see change your aperture magnitudes.
 
 


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