http://theappraisaliq.com/the-tilt-shift-lens-avoiding-architectural-distortion - The Canon 24mm Tilt Shift Lens is used to minimize perspective distortion in architectural photography. If your buildings are leaning backwards in your architectural photos, you need to use a Shift Lens to make them stand up straight. Watch a short, informative video on the difference a tilt shift lens will make in your building photography.
