Occasionally, you may want to use the exact same exposure settings for a series of shots. For example, suppose that you're shooting several images of a large landscape that you want to join together into a panorama in your photo editor. Unless the lighting is even across the entire landscape, the camera may select different exposure settings for each shot, depending on o
which part of the scene is currently in the frame. That can lead to weird and noticeable breaks in the brightness and contrast of the image when you seam the image together.
To lock in exposure, you can AE Lock button simply switch to M (manual) exposure mode and use the same settings for each shot. Or, if you prefer to take advantage of autoexposure, you can press and hold the AE (autoexposure) Lock button, highlighted in Figure 5-19. Exposure remains locked for as long as you press the button, even if you release the shutter button.
You can even go one step further and customize the behavior of the AE Lock button via a Custom Function. You can swap the tasks of the shutter button and AE Lock button, for example, so that pressing the shutter button halfway locks exposure and pressing the AE Lock button locks focus. Chapter 11 offers details. (When working with this book, however, stick with the default arrangement so that my instructions work as they should.)
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