Understanding ISO Sensitivity

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ISO refers to the senstivity -the signal gain-of the camera. In simply,ISO is simply a camera setting that will brighten or darken a photo. As you increase your ISO number, your photos will grow progressively brighter. For that reason, ISO can help you capture images in darker environments, or be more flexible about your aperture and shutter speed settings.



WHAT IS BASE ISO?

The lowest native ISO on  camera is  “base ISO”. This is a very important setting, because it gives you the potential to produce the highest image quality, minimizing the visibility of noise as much as possible

 

ISO VALUES

  • ISO 100 (low ISO)
  • ISO 200
  • ISO 400
  • ISO 800
  • ISO 1600
  • ISO 3200
  • ISO 6400 (high ISO)
LOW VS HIGH ISO NOISE VISIBILITY

  Take a look at the comparison below. Pay attention to the level of noise (graininess and    blotchy colors) in the images:



The difference is clear – the image at ISO 3200 has much more noise than the one at ISO 200 (which I brightened with a long shutter speed instead). This is why you should avoid high ISOs whenever possible, unless conditions require you to use them.

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