A Short Course in Canon EOS Digital Rebel XSi/450D by Dennis P. Curtin

By Dennis P. Curtin

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3. Take the photo and the shifted program setting is cancelled if you release the shutter button and pause a few seconds. If you take another picture before metering turns off, you reuse the shifted settings. You can also hold the shutter button halfway down to keep the shifted setting from changing. When ready, release the shutter button then press it down again to focus and take the picture. One reason to use program shift is that it prevents you from choosing settings that exceed your camera’s exposure limits.

3. Highlight your choice and press SET. com/itext/highlight/ Click to explore how overexposed highlights blink. (shadows) on the left to 255 (highlights) on the right. Think of it as a line with 256 spaces on which to stack pixels of the same brightness. Since these are the only values that can be captured by the camera, the horizontal line also represents the camera’s maximum potential tonal range or contrast. The vertical axis represents the number of pixels that have each of the 256 brightness values.

When ready, release the shutter button then press it down again to focus and take the picture. One reason to use program shift is that it prevents you from choosing settings that exceed your camera’s exposure limits. In shutter-priority (Tv) and aperture-priority (Av) mode it’s possible to select a setting that can’t be matched. For example, you may pick an aperture that’s so large the camera doesn’t have a shutter speed that’s fast enough to prevent overexposure. Although aperture-priority and shutter-priority modes warn you when this happens (page 41–42), you may not notice the warning.

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