This filter lets you simulate but also correct the typical distortion effect introduced in photo images by the glasses contained in the camera lenses.
The allowed range of all options is from -100.0 to 100.0.
The result of your settings will appear in the Preview without affecting the image until you click on
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The Main or Edge options must be non zero for this option to produce noticeable results.
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As above this option produces visible results only if the Main or Edge options are non zero.