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Determining Distortion With Check Lines
If your scene has long, straight, lines, check to see if they are truly straight in the image: click Add Line at the bottom of the Lens panel and draw an alignment line along the line in the image (select No Alignment). If the lines match all along their length, the image is not distorted.
If the image is distorted, you can adjust the lens panel’s Lens Distortion spinner until the lines do match; add several lines if possible. Create lines near the four edges of the image, but stay away from the corners, where there is more complex distortion. You will also see a lens distortion grid for reference (controlled by an item on the View menu).
This is only a quick and dirty initial approach for relatively undistorted shots, especially if the camera has little motion, such as a hand-held closeup intended to be stationary. For more significant and accurate distortion, see the Camera Calibration guide.
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