A Tilt-Shift lens is one where you can vary the plane against which the image falls. You've probably seen these, think of the old-timey bellows-lens with individual adjustments on those metal rails, so each of the four corners of the lens can be moved back and forth independently.

For certain types of images, a narrow depth of field can make a real scene appear to be artificial, ie a miniature or model.

You can also fake the "tilt shift" effect in photoshop, and make your own minature places.

step by step guide
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