How sonar focusing works
As you beg
in
to press the shutter
button, your camera releases sound
waves to the central part of the scene
(approximate area marked
in
blue).
The frequencies are far beyond our
range
of
hearing and travel at the
speed
of
sound (1,100 feet per
second).
3
The spl it second it takes for the
sound to reach your subject and
the echo to return is fed into a tiny
electronic computer inside the
camera.
The computer uses this time mea-
surement to calculate the distance
between the camera lens and your
subject, then signals a motor to turn
the lens unti I your subject
is
in
sharp focus.
This extraordinary chain of events
takes place
in
less than
113
of a
second.
How sonar focusing works
As you beg
in
to press the shutter
button, your camera releases sound
waves to the central part of the scene
(approximate area marked
in
blue).
The frequencies are far beyond our
range
of
hearing and travel at the
speed
of
sound (1,100 feet per
second).
3
The spl it second it takes for the
sound to reach your subject and
the echo to return is fed into a tiny
electronic computer inside the
camera.
The computer uses this time mea-
surement to calculate the distance
between the camera lens and your
subject, then signals a motor to turn
the lens unti I your subject
is
in
sharp focus.
This extraordinary chain of events
takes place
in
less than
113
of a
second.
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