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Exposure and ISO – Exposure Therapy

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To demys­ti­fy the con­cept of exposure—to make it approach­able for beginners—many writ­ers present inac­cu­rate expla­na­tions of what ISO is and how it works. Unlike the aper­ture and shut­ter, which are phys­i­cal mech­a­nisms, the ISO describes an elec­tron­ic func­tion that sim­u­lates changes to expo­sure. ISO is not a vari­able of expo­sure because it doesn’t affect the amount of light the image sen­sor receives. Instead, ISO set­tings deter­mine how bright­ly the cam­era ren­ders a pic­ture giv­en the expo­sure you have set using the aper­ture and shut­ter speed. Thus, ISO lets you change pic­ture bright­ness with­out fur­ther adjust­ing your aper­ture or shut­ter set­tings or, if pos­si­ble, chang­ing sub­ject bright­ness by adding or sub­tract­ing light from the scene. The stan­dard ISO scale is easy to remem­ber and fol­lows a sim­ple geo­met­ric pro­gres­sion: 50, 100, 200, 400, 800, 1600, 3200, 6400, 12,800, 25,600, etc. The avail­able range will vary depend­ing on the ma

Exposure and ISO Xiaolanzhen, Guang­dong, 2016. I cap­tured this image using a Fuji­film X‑T2 cam­era paired with the XF 56 mm ƒ/1.2 lens. As I didn’t have my tri­pod with me at the time, my only option for ensur­ing an ade­quate­ly bright and sharp pho­to was to shoot at ISO 3200. ISO simulates exposure To demys­ti­fy the con­cept of exposure—to make it approach­able for beginners—many writ­ers present inac­cu­rate expla­na­tions of what ISO is and how it works. Unlike the aper­ture mech­a­nism and shut­ter mech­a­nism, which are both phys­i­cal parts of the cam­era, ISO describes an elec­tro

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