So 3200 is 32x more ‘sensitive’ than 100. You can also increase exposure using only the ISO. The exposure value scale still works: add ISO 100 everywhere in the previous diagram. Thus, ISO becomes the third parameter that you can control in-camera. With a higher ISO setting, you can make your sensor more ‘sensitive’ to light. You can’t play with aperture or shutter speed. You can find yourself in a situation where your other parameters are fixed. However, your image might not look as bright as you’d wish. That current is then converted into image data using an analogue-to-digital (A/D) converter. Using ISO to Increase Light SensitivityĪs we discussed, when light hits the sensor, it generates a current. 4 EV is a 2 4 times higher amount of light. If you double the shutter speed to 2 seconds and decrease the aperture to f/1.4, you’ll still be at 0 EV. In the middle, 0 EV is defined as 1 second at f/1.Īny other combination resulting in the same amount of light is also 0 EV. This can be illustrated on an infinite scale of combinations. The point is to combine f-stop and shutter speed into one number: the EV. It later became the Exposure Value System. In the middle of the 20th century, a simplifying effort was launched. If you give with one hand and take with the other, the total won’t change. If you double the size of the aperture, you have to half the shutter speed. These two can be changed in such a way that the total amount of light doesn’t change. It also reflects the transmission of exposure settings. What Is Exposure Value?Įxposure value is the popular way of expressing aperture and shutter speed at once. This is an absolute way of expressing camera exposure, without considering the sensor type and size. The above listed three factors determine the total light getting onto the sensor.
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