Skip to Main Content
The Canon EOS Digital Rebel XS/1000D Companion
book

The Canon EOS Digital Rebel XS/1000D Companion

by Ben Long
November 2008
Beginner to intermediate content levelBeginner to intermediate
288 pages
7h 38m
English
O'Reilly Media, Inc.
Content preview from The Canon EOS Digital Rebel XS/1000D Companion

Thinking Again About Full Auto Mode

Now that we've identified all the mechanisms that go into making an exposure, let's look again at the Full Auto mode that you've been shooting with. As you learned in Chapter 1, when you press the XS shutter button halfway down, the camera focuses and calculates an exposure. That exposure is a shutter speed setting, aperture setting, and ISO choice. The camera has determined that these settings will yield an image that is neither too bright nor too dark.

When the camera has calculated these values and autofocused, it displays its choices in both the viewfinder and rear LCD status displays. These numbers should make a little more sense to you know.

As you just learned, many combinations of shutter speed and aperture settings yield the same overall exposure. So, how does the camera choose? Its algorithms are designed to take the "safest" possible combination, that is, a shutter speed and aperture that will yield a good overall exposure, without risking handheld shake from a slow shutter speed, or image softness from an extreme aperture.

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

The Canon EOS Digital Rebel T1i/500D Companion

The Canon EOS Digital Rebel T1i/500D Companion

Ben Long

Publisher Resources

ISBN: 9780596156626Errata Page