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Digital SLR Photography All-in-One For Dummies, 2nd Edition by Robert Correll

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Chapter 1: Working with Apertures

In This Chapter

arrow.png Understanding apertures

arrow.png Setting the aperture

arrow.png Discovering depth of field

When you’re determining exposure, one criteria to keep in mind is something called an aperture (the other two criteria, covered in upcoming chapters, are shutter speed and ISO sensitivity). The aperture is the opening in the lens that lets light pass into the camera body.

In this chapter, you read about not only how they affect exposure, but also how apertures work, what to call them, and how you can control them. You also read about the side effect aperture has on a photo. Namely, it ­contributes to defining the scene’s depth of field (DOF). Armed with this information, you can move beyond your camera’s automated shooting modes (if you like) and purposefully take photos with different creative goals in mind.

Stick with the material in this chapter, even if it seems confusing at first. As you shoot and evaluate your own photos, it’ll make more sense.

You Have a Hole in Your Lens!

Did you know that your lens has a hole in it? Every lens has one. It’s called the aperture, and it’s supposed to be there. The aperture is what allows light to pass through the optical ...

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