4. Apply more pressure to the shutter release to press it in all the way. The camera then
takes the picture and saves it to memory.
FIGURE 3-9 The spot meter is a great tool for reading the proper exposure in one precise
point of the image.
CHAPTER 3: Understand Exposure 61
Some cameras use a separate button to lock the exposure. Refer to your camera??™s
manual to see if it has exposure lock and how to use it.
The magic of exposure lock is that as long as you continue applying pressure to the exposure
lock control, the camera will use that locked-in exposure information regardless of where you
later point the camera. You can lock in exposure information for the sky and then point the
camera at your feet and snap the shutter release all the way. You??™ll take a picture of your feet
using the sky??™s exposure data. You probably wouldn??™t want to do that since the result will be
totally underexposed, but it gives you an idea of the potential.
Some digital cameras have a separate focus lock and exposure lock control; you should
check your camera??™s manual for details. In such cameras, there??™s a separate button somewhere on
the camera (usually where your thumb would fall on the right side of the camera body), possibly
labeled AEL (short for auto-exposure lock).
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