The Correct Camera Distortion dialog box enables you to fix common lens distortion problems, like darkened edges caused by lens faults or improper lens shading. For example, in a picture of the sky taken in low light, the corners of the image may be darker than the center. Changing the vignette amount and midtone settings fixes the distortion.
You can also use the perspective controls to rotate an image or fix image perspective caused by vertical or horizontal camera tilt. The Correct Camera Distortion filter’s image grid allows you to make these adjustments easily and accurately.