Canon EOS 90D For Dummies
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Your digital camera’s aperture settings (f-stops) can make a world of difference, so choosing the right f-stop can be an important part of creating a perfect finished picture. You need different f-stops for different photographic situations:

Use an almost-wide-open f-stop to boost sharpness.

Use an almost-wide-open f-stop to boost sharpness.

Most cameras and lenses are their sharpest when they’re closed down only one or two f-stops from wide open. This setting can also help you stop camera or subject motion, creating a clear action shot, like in this figure.

Adjust your depth of field by moving f-stops.

Adjust your depth of field by moving f-stops.

Changing your f-stops can stretch your depth of field usefully or trim it for creative effect. Stopping down or opening up an f-stop or two can produce dramatically different results, as shown in this figure.

Avoid too-small f-stops.

Avoid too-small f-stops.

Using the smallest possible f-stop can cause defraction, and you lose any sharpness you think you gain in depth of field. In addition, small f-stops can accentuate the appearance of any tiny dust motes on your sensor (see this figure). These imperfections, at larger apertures, are fuzzy and virtually invisible.

About This Article

This article is from the book:

About the book authors:

Robert Correll has more than two decades of experience in writing and photography. He is the author of all previous editions of Digital SLR Photography All-in-One For Dummies and has written several other books specific to individual DSLR camera models. Julie Adair King is a veteran photography professional and instructor with more than 60 books to her credit. She has written all editions of Digital Photography For Dummies as well as 40 guides to DSLR camera models.

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