September 2008
Beginner to intermediate
288 pages
9h 36m
English
Content preview from The Canon EOS Digital Rebel XSi/450D Companion
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CHAPTER 5
SUMMING UP
106
camera focuses and calculates an exposure. at exposure is a shutter speed set-
ting, aperture setting, and ISO choice. e camera has determined that these set-
tings will yield an image that is neither too bright or dark.
When the camera has calculated these values and autofocused, it displays its
choices in both the viewfinder and rear LCD status displays. ese 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.
Summing Up
I’ve thrown a lot of theory at you in this chapter, and it’s worth spending a little
time studying it. However, the rest of this book will reinforce these theories with
actual practice.
To sum up, it takes a certain amount of light to yield an image that is neither too
bright nor too dark. Your camera offers two ways to control this light: shutter
speed and aperture. Shutter speed allows you to control how still or blurry a sub-
ject is, while aperture lets you control how deep the depth of field in your image
is. In addition, ISO lets ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.