Canon TS-E17mm f/4L Instructions Manual page 7

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Slide the tilt-lock button in the direction of
arrow A. Loosen the tilt lock knob by turning
it in the direction of arrow B.
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Turn the tilt lock knob in the direction of the
arrow to lock the amount of tilt for the shot.
Turn the tilt knob to adjust the amount of tilt.
Focus the shot by turning the focusing ring.
To keep the tilt scale locked in the "0" position. slide
the tilt lock button in the direction of "LOCK", then turn
the tilt lock knob in the direction of the arrow shown in
Step 3.
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When you tilt the lens, sharp portions of the tilt
mechanism are exposed and care should be
taken to avoid touching these portions.
Shifting moves the optical axis of the lens in parallel off the center of the imaging
Shift can be used to good effect in the situations shown below.
• If you photograph a subject such as a
building with a normal lens, the top of
the building tapers away. But by placing
the camera parallel to the building and
shifting the lens, you can correct this
tapering effect.
plane.
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• When you are shooting a reflective
subject, you can move the camera to a
position where the camera does not
appear in the shot and then use shift to
take the picture. This lets you keep the
camera out of the shot without having
to change the shot composition.