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Help! My Fuji 16mm f1.4 is really distorted

Started Feb 17, 2022 | Questions thread
Truman Prevatt
Truman Prevatt Forum Pro • Posts: 14,596
Re: Help! My Fuji 16mm f1.4 is really distorted

Gary Martin wrote:

Someone correct me if I'm wrong, but I thought the exaggerated tilting of straight lines prevalent in wide angle lenses was called keystoning, whereas distortion is when straight lines are rendered as curved. As long as straight lines are kept straight (regardless of the angle), there's no actual distortion.

Perspective distortion is different than lens distortion. Keystoning is a term sometimes applied to converging lines. But the correct description is perspective distortion. That is lines in the image plane will remain parallel, while lines in a plane that is not parallel to the image plane will be compressed in separation behind the image plane and expanded in front.

https://fujilove.com/correcting-perspective-and-keystone-distortion-with-exposure-x4/

Most fully function S/W packages, C1, Adobe subscription have facilities to address this issue.  In DXO PL you will need to buy an add on package, Viewpoint.  In reality these S/W solutions will only address perspective distortion in one plane since the transform needed varies for planes intersections the lens axis at different distances from the camera.  For simple images - it works fine.  For more complex images it will be noticeable.  The appropriate way to correct for such distortion is a tilt/shift lens to control the actual image plane orientation.  The unfortunate thing is Fuji doesn't have any.

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