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Some examples of the effects PxrCamera can do:

Parameters

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Standard Perspective

fov 

Field of view (FOV) in degrees. For rectangular images this is normally the FOV along the narrower image dimension.

Tilt-Shift

tilt

Angle in degrees to tilt the lens. Makes the plane of focus non-parallel to the image plane. Has no effect unless depth of field is enabled. Positive tilts up, bringing the focus in the top of the image closer and pushing the focus in the bottom further. Negative does the reverse.

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Shift the lens vertically. This can be used to correct for perspective distortion "keystone" effects. To keep vertical lines parallel, aim the camera horizontally and adjust this to include the subject. Positive values shift towards the top.

Lens Distortion

radial1

Quadratic radial lens distortion coefficient. Positive values produce pincushion distortion. Negative values produce barrel distortion.

radial2

Quartic radial lens distortion coefficient. Positive values produce pincushion distortion. Negative values produce barrel distortion.

assymX

Distortion applied only in the X direction. Horizontal lines will remain straight. Positive values produce pincushion-like distortion. Negative values produce barrel-like distortion.

assymY

Distortion applied only in the Y direction. Vertical lines will remain straight. Positive values produce pincushion-like distortion. Negative values produce barrel-like distortion.

squeeze

Anamorphic lens squeeze. Values greater than one decrease the effect of the lens distortion in the X direction. Values less than one increase it.