Secondary effects: ISO

ISO is not too hard to understand: higher ISO values tend to have less detail than lower ISO values.  This lack of detail is manifested in noise: hard edges in a noisy image are not so hard.  Also, a solid surface will appear to be speckled. Modern cameras, especially ones made in 2014 and later, …

Primary Effects: ISO

The ISO[1] is the sensitivity of the sensor to the light that is hitting it.   There is not much to understand here on this leg of the Exposure Triangle: The higher the number, the more sensitive is the sensor. The numbers we use for ISO include: 50, 100, 200, 400, 800, 1600, 3200, 6400, … …