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    Chapter 5. A Brief History of Flash > Controlling flash exposure

    5.7. Controlling flash exposure

    In regular (non-flash) photography, there are three basic ways to control the exposure of an image.

    1. Shutter speed. The length of time that the shutter is open affects the duration of the exposure, since ambient light is essentially constant.

    2. Lens aperture. The adjustable size of the diaphragm on most lenses governs the quantity of light that enters the camera.

    3. Sensitivity of the digital sensor (ISO) or the film speed.


      

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