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Canon® EOS Rebel XSi/450D Guide to Digital SLR Photography by David D. Busch

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Focus Pocus

Although Canon added autofocus capabilities in the 1980s, back in the day of film cameras; prior to that focusing was always done manually. Honest. Even though viewfinders were bigger and brighter than they are today, special focusing screens, magnifiers, and other gadgets were often used to help the photographer achieve correct focus. Imagine what it must have been like to focus manually under demanding, fast-moving conditions such as sports photography.

Focusing was problematic because our eyes and brains have poor memory for correct focus, which is why your eye doctor must shift back and forth between sets of lenses and ask “Does that look sharper—or was it sharper before?” in determining your correct prescription. Similarly, manual ...

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