Sony SLT-A57 &alpha - Lens Compensation; Lens Comp.: Peripheral Shading; Lens Comp.: Chromatic Aberration; Lens Comp.: Distortion

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Lens compensation
You can automatically compensate the following characteristics: light fall-
off at the edges, chromatic aberration, and distortion (only for automatic
compensation compliant lenses). For further information on automatic
compensation compliant lenses, visit the Sony web site in your area, or
consult your Sony dealer or local authorized Sony service facility.
Compensates for the shaded corners of the screen caused by certain lens
characteristics. This item is set to [Auto] in the default settings.
MENU button t 4 t [Lens Comp.: Shading] t Select the
desired setting
Reduces the color deviation at the corners of the screen caused by certain
lens characteristics. This item is set to [Auto] in the default settings.
MENU button t 4 t [Lens Comp.: Chro. Aber.] t Select the
desired setting
Compensates for the distortion of the screen caused by certain lens
characteristics. This item is set to [Off] in the default settings.
MENU button t 4 t [Lens Comp.: Distortion] t Select the
desired setting
Lens Comp.: Peripheral Shading
Lens Comp.: Chromatic Aberration
Lens Comp.: Distortion