Selective focus can be used to direct the viewer's attention to a small part of the image while de-emphasizing other parts.
With tilt, the depth of field is wedge shaped. Using a large amount of tilt and a small f-number gives a small angle at the apex of the wedge, and a narrow DoF. If the plane of focus is at a large angle to the image plane, the DoF may be more easy to envision as a "height of field" (with tilt) or a "width of field" (with swing).
The effect is different from that which obtains from using a large f-number without tilt. In a normal photograph, the PoF and the DoF are perpendicular to the line of sight; with tilt, the PoF can be almost parallel to the line of sight, and the DoF can be very narrow but extend to infinity. Thus parts of a scene at greatly different distances from the camera can be rendered sharp, and selective focus can be given to different parts of a scene at the same distance from the camera.
With tilt, the depth of field is wedge shaped. Using a large amount of tilt and a small f-number gives a small angle at the apex of the wedge, and a narrow DoF. If the plane of focus is at a large angle to the image plane, the DoF may be more easy to envision as a "height of field" (with tilt) or a "width of field" (with swing).
The effect is different from that which obtains from using a large f-number without tilt. In a normal photograph, the PoF and the DoF are perpendicular to the line of sight; with tilt, the PoF can be almost parallel to the line of sight, and the DoF can be very narrow but extend to infinity. Thus parts of a scene at greatly different distances from the camera can be rendered sharp, and selective focus can be given to different parts of a scene at the same distance from the camera.
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