Understanding ISO Settings in Photography

ISO, like exposure and aperture, is one of the three fundamental components of the exposure triangle. Of the three, it tends to be the photography setting that most confuses people. This is a real shame since it’s really not a difficult concept to understand. In fact, the ISO effects two things:

  1. The amount of light in a scene that’s required to produce a given exposure.
  2. The image quality and amount of noise in the image.

By the end of this guide, you will have a solid understanding of what the ISO is and how to properly control it to obtain the best possible exposure for your images. Let’s jump right in!

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The Definitive Guide to Aperture and Depth of Field

One of the fundamental concepts of photography is that of aperture. Along with the shutter speed and ISO, aperture is part of the exposure triangle that controls the overall exposure of an image. In addition to this, aperture also affects the depth of field in an image. In short, the aperture (which is measured in f-stops) controls two factors:

  1. The amount of light that is able to reach the image sensor, which in turn controls the image’s overall exposure.
  2. The depth of field (DOF) of the image. The depth of field is simply how much of your image is in focus. Don't worry, there will be more of this later on :)

By completing this article, you'll understand what aperture is, how it affects an image's depth of field and how to select the correct f-stop settings to achieve the optimal depth of field for any given scenario. 

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