Re: Pre-order: Sigma 85mm f/1.4 DG DN Art ($1,199)
numbertwo wrote:
The problem with correction profiles is that for flat surfaces, or when everything is at the same distance, they are more or less fine (despite slight loss in resolution), but for real world, some undesirable results might happen when you apply a 2D correction in a 3D world...
Generally speaking, I don't think this should be a concern. From what I understand about optics & physics (which admitted is not a whole lot), a lens could not distort (in the typical pincushion/barrel type of distortion that we're discussing) in a three-dimensional manner, this would require the lens to be capable of breaking basics laws of physics, for instance, seeing behind an object and thus distorting it/bring it into or out of view in a three-dimensional way.
Everything I know about this type of distortion tells me that two-dimensional corrections are completely appropriate, and many modern lenses are designed to have these qualities corrected in software rather than with glass. The drawback to correcting this type of distortions in software tends to be a loss of resolution and/or slight crop to the image.
Aug 09, 2020 at 10:09 PM
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