Scheimpflug principle
In this illustration, the sensor plane and lens plane are par-
allel producing a subject plane that is also parallel.
At the widest aperture the depth of field is very restricted.
The yellow objects are in focus as they are on the same
plane, along with some of the red object. The green ob-
jects are out of focus.
Image plane
Depth of field does not extend to
the green objects at full aperture
Object in focus
Object out of focus
Lens plane
Subject plane
34
Object out of focus
Out of focus
here
Object in focus
continued overleaf