How to Use Autofocus in Photography


show more Autofocus provides you with in-depth training on Photography. Taught by Ben Long as part of the Foundations of Photography: Exposure show less
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Autofocus

As you may recall from high school biology class, there are two types of light-sensitive cells in your eye: rods and cones. Codes are the color-sensitive cells and most of the cones in your eye are gathered into a very small area at the back of your eye, called the fovea. The fovea is responsible for the focused part of your field of view. Now it is not immediately obvious, but the only part of your field of view-- that is, the only part of all of the stuff that you can see-- the only part that is in focus is an area roughly the size of the tip of your thumb when held at arm's length.

That is this little bit right here. Now if you don't believe that, give this a try. Get a piece of paper that has some text on it, tear a page out of a magazine or just use a book or something. Hold it at arm's length and put your thumb in the middle of it. Now, focus your eyes on your thumb, and with your peripheral vision try to read the text that's around your thumb. You should find that you...

Autofocus
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Autofocus provides you with in-depth training on Photography. Taught by Ben Long as part of the Foundations of Photography: Exposure

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Photography
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