GoPro lens - could it have been rectilinear?

Discussion in 'Digital Cameras' started by Peabody, Feb 27, 2014.

  1. Peabody

    Peabody Guest

    I don't have one myself, but every video I've seen from a GoPro has used a
    wide-angle lens that is moderately fisheye - meaning that the horizon and
    other straight lines bend unless they go through the center of the lens. I
    guess it's really just plain old barrel distortion.

    Would it have been possible for GoPro to use a lens with the same 127-
    degree field of view, but rectilinear instead of fisheye? If it is possible,
    would it have been prohibitively expensive for a camera of this price range?

    Well, obviously I don't know anything about lens design, but to my eye the
    fisheye effect, even though modest, is a "con" for this camera, and just
    wondered if a different approach might have been possible, or might be
    possible, without losing the wide angle field of view.
     
    Peabody, Feb 27, 2014
    #1
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  2. Peabody

    RichA Guest

    They wouldn't get the same drug-addled looking distortion their youtube pandering buyers like.
     
    RichA, Feb 28, 2014
    #2
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  3. It could be done with fancy optics, but then you'd have extreme
    rectilinear distortion. Fisheye probably looks better at 127 degrees.
    Distortion is the nature of changing the viewing angle so much between
    recording and playback.
     
    Kevin McMurtrie, Feb 28, 2014
    #3
  4. Peabody

    Sandman Guest

    Why? Just do it in post. Get a lens profile for Photoshop or Premier, one
    second of googling gave me this:

    <http://www.htw-mechlab.de/index.php/undistortion-der-gopro-hd-hero2/>
     
    Sandman, Feb 28, 2014
    #4
  5. Peabody

    Robert Coe Guest

    : I don't have one myself, but every video I've seen from a GoPro has used
    : a wide-angle lens that is moderately fisheye - meaning that the horizon
    : and other straight lines bend unless they go through the center of the
    : lens. I guess it's really just plain old barrel distortion.
    :
    : Would it have been possible for GoPro to use a lens with the same 127-
    : degree field of view, but rectilinear instead of fisheye? If it is
    : possible, would it have been prohibitively expensive for a camera of
    : this price range?
    :
    : Well, obviously I don't know anything about lens design, but to my eye
    : the fisheye effect, even though modest, is a "con" for this camera,
    : and just wondered if a different approach might have been possible,
    : or might be possible, without losing the wide angle field of view.

    Because of the way a GoPro is used, weight must be a major consideration. The
    more correction elements you incorporate, the heavier the lens will be.

    Bob
     
    Robert Coe, Mar 9, 2014
    #5
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