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Exposure – Relation Between Shutter Speed and Aperture Value

Here are some real-world examples of a scene taken within a few seconds of each other in two ISO settings (100 and 200).

Figure 9: ISO 100 Example

With the ISO 100 setting example all four images have the same exposure, but the shutter and aperture combination are different.

For every stop of shutter speed increase (e.g. 100 to 200, 200 to 400), we need to open up the aperture by the same full stop (eg. f/11 to f/8, f/8 to f/5.6). The two setting maintains the same ratio.

Figure 10: ISO 200 Example

Figure 10: ISO 200 Example

In Figure 10, we increased our ISO from 100 to 200, a full stop as well. As you can see, the proportion from 1/200 to 1/1250 shutter speed increase is maintained by the opening of the aperture value from f/10 to f/4. The four exposures are still identical.

I hope these examples helped you understand how changing each of the three parameters affect your exposure.

There are no rules in exposure as certain scenes or artistic preference may call for intentional under or over exposure, understanding the three parameters discussed will allow you to apply that decision to your photographs.

Now go fiddle with your exposures to take more creative images!

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