Light and Time

The two fundamentals of taking a photograph are light and time.

• Light comes in via the lens and strikes the sensor, and

• Time determines how long the light strikes the sensor for.

If you get these two aspects correct then you achieve an accurate exposure. If you have too little light or not enough time then you get a dark picture which is considered 'underexposed'. Too much light or too much time results in a picture which is too bright or overexposed.

The Time element is controlled by the Shutter Speed selected and the amount of time the shutter mechanism remains open for. The Light element is controlled by the size (diameter) of the Aperture.

FIG. 1.8 Close up mode. FIG. 1.9 Night mode.

I always encourage my students to remember: big numbers have a small hole — low numbers have a large hole.

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