Canon EF LENS TS-E24MM F/3.5L Instructions Manual page 7

3. Tilt Function
Tilting inclines the lens relative to the image plane. When the tilt scale is set to the "0" position, the
focusing and imaging planes are parallel. However, tilting puts the focusing plane at an angle to the
imaging plane.
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Example 1 Example 2
To shoot so that all of an extensive subject is in focus, you must normally use a small aperture to
obtain a large depth of field. But tilting allows you to keep all of the subject in focus even when there
is insufficient depth of field (Example 1). Or, by tilting in the opposite direction, you can focus on a
specific part of the subject (Example 2).
ENG-6