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Anonymous
>>234422 The lens tilts and slides in parallel to the light-sensitive surface, actually 'moving' the image projected. This enables you to do some tricks such as disappearing from a mirror's reflection by shooting from just outside the mirror's frame and centering the image on the sensor by sliding the lens. What the tilt does is change the inclination of the plane of focus, making it not be parallel to the surface, and thus giving you the ability to either: create strong out of focus blur while using a closed aperture or keeping things at very different depths in sharp focus.
Its most useful application, or what it's known the most for is this:
If you want to take a picture of a building, you usually have to tilt your camera upwards to fill the frame with the building. What this causes though is to create an image with 3 point perspective (the top looks tiny, the bottom looks large and wide). With one of these lenses, though, you can keep the camera in parallel to the ground and just slide the lens upwards a bit. This will give you an image with a more flat perspective of the building.
Tilt and shift is the commercial name for it, but something a bit more accurate might be "perspective correction".
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