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Nikon® D90 Digital Field Guide by J. Dennis Thomas

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Chapter 5. Essential Photography Concepts

In This Chapter

Exposure review

Understanding depth of field

Rules of composition

Lighting essentials

This chapter contains some concepts that may be well-known to some D90 users, while other users may need a refresher. Some of this information may be brand-new to those of you who are just stepping into the world of dSLR photography. If you're an advanced user, you may want to skip this chapter, although you may discover some new information or something you may have forgotten. This chapter covers information on exposure, the effects aperture has on depth of field, and some tips and hints on composition and lighting.

Exposure Review

An exposure is made of three elements that are all interrelated. Each depends on the others to create a good exposure. If one of the elements changes, the others must increase or decrease proportionally. The following are the elements you need to consider:

  • Shutter speed. The shutter speed determines the length of time the sensor is exposed to light.

  • ISO sensitivity. The ISO setting you choose influences your camera's sensitivity to light.

  • Aperture/f-stop. How much light reaches the sensor of your camera is controlled by the aperture, or f-stop. Each camera has an adjustable opening on the lens. As you change the aperture (the opening), you allow more or less light to reach the sensor.

For this image, I exposed for the brightest part of the scene, allowing the sky to have deep rich colors while letting the surrounding elements appear as shadows.

Figure 5.1. For this image, I exposed ...

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