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Exposure – Relation Between Shutter Speed and Aperture Value

Take a look at Figures 1 & 2. Figure 1 illustrates the relationship between shutter speed, aperture, and ISO/ASA.

Assuming ASA/ISO values didn’t change (red line) the smaller your aperture, the slower the shutter speed required to obtain the same exposure. As you increase shutter speed (vertical line) you’ll require a larger aperture opening to obtain the same aperture.

Figure 1: Shutter, Aperture, ISO relation

Figure 1: Shutter, Aperture, ISO relation

If you alter the film speed or ISO sensitivity of your sensor, the red line will shift and so will the shutter speed and aperture, but the proportion is still the same, as illustrated in Figure 2.

Figure 2: ASA/ISO Value Change

Figure 2: ASA/ISO Value Change

Here’s a simple analogy – A faucet, water, and a pail. The end goal is similar – to fill the pail with water.


Let’s go into details on each of the critical elements on the next page.

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