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David Busch’s Canon® EOS M Guide to Digital Photography by Lee Sheldon

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How Focus Works

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.

I don’t have to imagine it. I did it for many years. I started my career as a sports photographer, and then traveled the country as a roving photojournalist for more years than I like to admit. (Okay, eighteen years. You forced it out of me.) Indeed, I was a holdout for manual ...

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