DSLRAutoFocusModes.pdf

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DSLR AUTO-FOCUS MODES EXPLAINED
Quick Guide
Written by Jason Little
Photo by Spiros Vathis
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When first embarking on the journey toward becoming a
photographer, you were probably repeatedly told of the
importance of exposure and composition. You went through
all the pertinent exercises designed to help you grasp the
fundamental concepts behind exposure (aperture, shutter
speed, ISO), and you diligently worked on developing your
creative vision, because no one wants to be accused of using
boring composition. Accordingly, no one with even a basic
understanding of photography would suggest that composition
and exposure are unimportant, but neither element means much
if your photos aren’t in focus.
The audience needs to know what they are looking at; the
subject of a photograph needs a degree of definition that
renders it visually recognizable and conceptually relatable. Of
course, there are exceptions to be made such as in the case
of abstract photography, but before you can even think about
something like that you’ve got to first get a handle on the basics
of achieving proper focus.
DSLR AUTO-FOCUS MODES EXPLAINED //
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https://www.flickr.com/photos/gruenewiese/11030076394/
Photo by Olli Henze
DSLR AUTO-FOCUS MODES EXPLAINED //
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AUTOFOCUS POINTS
When you look through the viewfinder you see whatever your
lens is aimed at, but on the viewfinder display you also see the
camera’s focus points. Their exact appearance and arrangement
will vary by camera manufacturer and model; there will also
be some variation according to what AF mode you are using.
Furthermore, the number of autofocus points you see will
depend on how sophisticated the camera is. Entry level DSLRs,
for instance, may have as few as 7 points, while higher-end
DSLRs with considerably more complex focusing systems may
have more than 50 autofocus points. There are a number of
mirrorless cameras that boast upwards of 100 autofocus points.
Each AF point is one of two types: vertical type or cross-type.
Autofocus sensors of the vertical variety detect differences in
contrast only along the vertical axis of the area on which the
AF point is placed. Cross-type AF sensors are more accurate
because they detect differences in contrast along both the
vertical axis and horizontal axis. Most cameras contain a mix
of these two kinds of sensors. Basic DSLR models will typically
feature one cross-type AF point as the center point, with the
remainder being the standard vertical type. As you work your
way up the ladder of camera sophistication, the number of cross-
type points increases as does the accuracy and responsiveness of
the overall AF system.
This figure is an example of what your viewfinder display may look like.
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