Simply ISO Concept
The definition of ISO is the size of level of
sensitivity of camera censor toward light. More high the ISO setting , more
sensitive the camera censor toward light.
To get the clear description about ISO in our camera ( ASA in film photography case), let’s imagine about bee community.
To get the clear description about ISO in our camera ( ASA in film photography case), let’s imagine about bee community.
- An ISO is a worker bee. If we set the camera ISO in 100, it means we have 100 workers bee.
- And if we set the camera ISO in 200 , it means we have 200 worker bee.
The outlines:
- When we add the ISO setting from 100 to 200 (in aperture that always stable- we lock the aperture in f/3.5 or through Aperture Priority Mode- A or Av), to shorten the times in a half times ( twice more fast), from shutter speed 1/125 to 1/250 seconds.
- When we add again the ISO to 400, we can shorten the times of making picture untill an half again :1/500 seconds
- Every times shorten the times of exposure in an half, we called increase the exposure in the amount of 1 Stop.
You can try this
explanation in aperture case, always try to set the fixed shutter speed in 1/125 ( or through Shutter Priority mode-S or
Tv), and changes ISO setting in multiole 2 ; example from 100 t0 200 to 400 ,
and etc, take a look the changes of number of your Aperture
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