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Sort of 'fish-eye' lens problem

Prince WaoPrince Wao Posts: 373
in Technical Help (nuts n bolts)

I don't have any camera problems with 99% of my renders, but I recently had a problem which has twice come up before: I was asked to design a banner for a friend's site and I needed planets on the skyline, but as soon as I moved the planets to left and right they lost their roundness and became more extremely oval the further they were moved. In a render I did a few years ago which featured a self-designed character, repeated horizontally in variations of a costume, the outer figures became broader; and then in another old render characters to the far left and right in action poses had very elongated limbs. I assume there must be a simple camera adjustment to correct this sort of 'fish eye' lens effect, but I've experimented and have failed to solve it.

Comments

  • PaintboxPaintbox Posts: 1,633

    This is a normal effect for any lens. The wider your field of view, the more distortion you will see. In real world photography you either fix this with a special architectural camera or in image editing. It's usually called "Correct perspective" or something like that.

    It's not a "simple camera adjustment" by any means, its inherent when you draw perspective on a 2D plane. For more understanding on this subject, google "perspective lines" . For instance : https://www.artistsnetwork.com/art-mediums/drawing/learn-to-draw-perspective
    And
    https://en.wikipedia.org/wiki/Perspective_control

    I personally do not know if you can do this correction in DAZ itself.

  • Richard HaseltineRichard Haseltine Posts: 102,778

    Focal Length is the one that you want, the higher the les distortion, but you will then need to pull the camera back (a lot, by the found of it) to keep everything in the view.

  • PaintboxPaintbox Posts: 1,633
    Richard Haseltine said:

    Focal Length is the one that you want, the higher the les distortion, but you will then need to pull the camera back (a lot, by the found of it) to keep everything in the view.

    As OP described the scene, you would end up with a telescope! laugh

     

  • Richard HaseltineRichard Haseltine Posts: 102,778
    Paintbox said:
    Richard Haseltine said:

    Focal Length is the one that you want, the higher the les distortion, but you will then need to pull the camera back (a lot, by the found of it) to keep everything in the view.

    As OP described the scene, you would end up with a telescope! laugh

    Yes, hence my comment about pulling the camera back.

  • Prince WaoPrince Wao Posts: 373

    Thanks Richard and Paintbox! The focal length did sort the problem, also pulling the camera back. I can now redo an old composition re which I previously compensated for the elongated limbs, broadened bodies and heads by scaling down each part. It did the job, but altering focal length is a better and easier option! smiley

    Paintbox: a perspective correction tool would be a good addition for DS. At some point I intend to make some suggestions for the next DS, so I'll add that one. yes

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