Ordinary Camera Lens Tilt Shift Lens
Blue intensity qualitatively represents the degree of image sharpness at a given distance;
actual depth of field can be unequally distributed to either side of the focus plane.
Changing the angle between axis and film by tilting the lens standard backwards or forwards is called lens tilt or just tilt. Tilt is especially useful in landscape photography.
For both photos I also had the lens tilted into the scene to give me great depth of field from the foreground log to the background peak.
In contrast, the location of a telephoto lens's optical center causes the image on the ground glass to move as the lens tilts. This requires repositioning the groundglass or the lens (via camera movements) to reframe the photograph.
 See also: Space, Landscape, Sensor, Back, Near
  
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