RELATED: Your Camera's Most Important Settings: Shutter Speed, Aperture, and ISO ExplainedĪlong with shutter speed and aperture, ISO is one of the pillars of digital photography. On your camera, ISO 6400 is six stops brighter than ISO 100, not 64 stops brighter. This means that the difference in brightness between an image shot at ISO 100 and ISO 200 is the same as the difference in brightness between an image shot at ISO 800 and ISO 1600. Every time you double the ISO value, the brightness of the image increases by one stop. ISO is measured using a simple logarithmic scale. RELATED: What Is a "Stop" in Photography? This is why digital cameras are so much better in low light than film cameras. When you turn your camera’s ISO up from 100 to 200, nothing changes with the sensor the value of the charge the sensor detects (and the corresponding brightness of the pixels) is just doubled as you take the image. Instead, ISO values are emulated through amplification. While ISO 200 film is chemically different to ISO 100 film, a digital camera always uses the same sensor this means it’s always getting the same electric charge. The sensors are calibrated so that an image shot at ISO 100 on a digital camera would appear about the same as an image shot on ISO 100 film. The relationship between the charge detected by the camera and the brightness of each pixel is essentially arbitrary.
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