Lightroom: Lens corrections seem to be broken after update to LR 3.5rc

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  • Updated 7 years ago
  • (Edited)
I use the lens corrections feature a lot in LR but now that I have moved to 3.5rc I'm having problems with it. In particular the vertical and horizontal transform sliders under the manual tab just stretch or elongate "depending on which slider you use" the image instead of the normal functionality. I'm using a Canon 5D MkII and standard 24-105L lens and converting to DNG on import to LR. This has been my standard setup and process for the last few years with no issues.
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Eric Lawson

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Posted 7 years ago

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LRuserXY

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Perhaps you used the correction on fotos taken with longer focal lengths? Vertical and horizontal transform work quite differently for short and long focal length.

See also the reply I made at the end of the following thread: http://feedback.photoshop.com/photosh...
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Eric Lawson

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The photos weren't taken with longer focal lengths but there is something different about them that may play into this. After reading your linked thread I think it could be that the photos are small on the page. They are all of geometric shapes "badges in this case" and take up only 20 to 30% or so of the frame in the center. They are then cropped to a square with only a small border around them. Interesting behavior in LR if this is the case. Never ran across a situation where the lens correction feature didn't work out for me.

As shot:


Final output:
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LRuserXY

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Quote: "...take up only 20 to 30% or so of the frame in the center ... cropped to a square": Ok, that might explain it. Lightroom applies horizontal and vertical perspective correction only to the *uncropped* image, apparently based on the angle of view which is determined by looking at the sensor dimensions and the focal length in the EXIFs.

If you only use a small portion of the image in the center, you will see only the stretching/elongating you described. I tried this for some sample fotos, and 3.5RC behaves exactly as 3.4.1 as far as I can see. This is actually the same effect as I described in my post in the other thread: Cropping a tiny portion out of the image is like simulating a very long focal length. Because of the "compressed" look of long focal lengths, a perspective correction is much like a aspect ratio change nearly without any "sloping" (sorry, don't know the correct word for this) of the edges.

So I think LR behaves correclty in this case, but it would be great if an Adobe employee could verify this.

If you want to apply a controlled "linear" geometric distortion which is not strictly a perspective correction, I think you will have to resort to some external editing program (e.g. photoshop with its transformation feature or lens correction filter). Another option may be to export the cropped, but uncorrected image from LR, strip the EXIF data (or export it already with minimized metadata) and re-import it into LR, which in the absence of EXIFs seems to assume some default angle of view, which can be used to distort the image in a "normal/standard" fashion.
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Benjamin Warde, Employee

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I agree. To confirm, you could try the manual lens corrections on a file that worked as you expected in 3.4, to make sure that it still works the same in 3.5.

Thanks,
Ben