During photo shoot, why images on the iPhone screen are distorted?

Discussion in 'Cell Phone Cameras & Camera Phones' started by photo_abc, Mar 15, 2016.

  1. photo_abc

    photo_abc TPF Noob!

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    Hi, I try to take photo of an object on a table. Behind it, I see a vertical edge between two walls. My tripod is leveled. How come on the LCD screen of my iPhone 6s+, the virtual edge is not vertical? Similarly, yesterday I placed two objects next to each other with a gap in between. The edges are parallels but on the LCD screen of my phone, they are not. Anybody knows what is going on?


     
  2. Ysarex

    Ysarex Been spending a lot of time on here!

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    Either the camera is tilted and/or the lens is distorting the image. Show us photos.

    Joe
     
  3. The_Traveler

    The_Traveler Completely Counter-dependent Supporting Member

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  4. photo_abc

    photo_abc TPF Noob!

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    Thank you. Yes, that is the problem I mentioned. Is there a way to fix this problem? I read that lens from Moment do not have distortion but the iPhone 6s+ has. Will the problem be solved (or improved a lot) if I use Moment lens? Should I use Wide lens?
     
  5. Ysarex

    Ysarex Been spending a lot of time on here!

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    What is the problem you mentioned? Distortion in the lens or distortion due to tilting the camera? Show us photos.

    Joe
     
  6. The_Traveler

    The_Traveler Completely Counter-dependent Supporting Member

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    Perspective distortion exists with any lens - and with your eyes as well. When you perceive distortion with your eyes, your brain that tells you the perspective distortion is normal.
    You can't really 'correct' it, you can only minimize it by having some distance between the lens and the object and have the plane of the sensor as much as possible parallel with teh plane of the subject.
     
  7. photo_abc

    photo_abc TPF Noob!

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    [​IMG] As shown in the photo, the vertical edge of the wall is tilted. If you look at the top left corner, you can see more distortions both vertically and horizontally. Trying to make the vertical edge looks vertical on the iPhone tilts the horizontal edges more. Also, the Windows XP CD cover looks distorted.



    bbqbuild's Library Slideshow
     
    Last edited: Mar 15, 2016
  8. Ysarex

    Ysarex Been spending a lot of time on here!

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    OK what you're seeing is commonly called perspective distortion but more accurately should be called shape distortion. It's not your lens. You have the plane of the sensor turned/tilted to the planes in the subject. All cameras will do this in the same way. The solution is to keep the plane of the sensor parallel to the plane of the subject or make the correction in software.

    Joe

    distort.jpg
     
  9. photo_abc

    photo_abc TPF Noob!

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    Thanks. So, buying the Wide or Tele lens from Moment will not hep.

    "The solution is to keep the plane of the sensor parallel to the plane of the subject or make the correction in software."

    Sorry I don't get it. What plane of the sensor and what plane of the subject? Is there an illustration?
    How to correct it in software?
     
  10. Designer

    Designer Been spending a lot of time on here!

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    Correct; a wide angle lens will only make the distortion more pronounced.

    The sensor is the part inside your phone (or any electronic camera) that converts the light rays into digital information. Since most sensors are positioned parallel to the back of the phone, it's easy to assume that the back of the phone is for all practical purposes is the same as the sensor. Hold your phone with the main flatness of the phone perpendicular to your subject.

    Correcting distortion in editing is an advanced technique that some softwares are capable of.
     
  11. Ysarex

    Ysarex Been spending a lot of time on here!

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    Buying the Moment lens will not help.

    The sensor in the camera is a two dimensional flat plane. Two dimensional planes exist in what you're photographing. The folder on the table is a rectangular flat plane. The walls and table are also flat planes. In your photo the camera sensor plane is not parallel to the folder plane and so the folder is no longer a rectangle but a trapezoid (illustration). And the same is happening to the walls. Your subject has multiple planes that are not parallel to each other and so you have set up a situation where you must distort the shape of at least two the three planes in the scene. You positioned the camera to distort them all.

    Editing software can at least partially correct shape distortion if it isn't too severe. I used Photoshop.

    Joe

    trapezoid.jpg
     
  12. photo_abc

    photo_abc TPF Noob!

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    Thanks. My main issue right now is the vertical edge of the wall. If that could be correct, it would be sufficient.
     

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