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When photographing buildings or large structures with ordinary lenses such as the Bay Bridge here in San Francisco, it is typically impossible to capture the entire structure without tilting your camera upwards (unless you have access to a helicopter). But when you tilt your camera upwards, your perspective changes, making the top of the structure appear smaller and sometimes tilted (as illustrated here) compared to the bottom of the structure.
"PC" ("Perspective Control") lenses or view cameras with shift/tilt capabilities can overcome this problem of perceived distortion by shifting the lens upward in a frame that is parallel to its subject. If you don't have such a lens or camera, your only alternative is to make perspective corrections afterward in photo-editing software like Adobe Photoshop.
This lesson demonstrates how to adjust for perspective digitally for professional, architectural results.
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