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Re: [PanoToolsNG] Action stereo spherical panos -- sync issues

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  • Roger D. Williams
    ... I am impressed. The stereo panorama looks fine, so the system is clearly viable (if a bit pricey from where I sit...). ... I agree; that accords with my
    Message 1 of 2 , Aug 3, 2008
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      On Sun, 03 Aug 2008 19:57:02 +0900, panovrx <mediavr@...> wrote:

      > A while back I put two Canon5D/10.5mm together (one on top of the
      > other inverted) at 180 apart to make 360*130 degrees timelapse
      > sequences and this works pretty good sync wise in the overlap edge
      > zone if the frame rate is
      > slow enough -- eg. they will stay in sync for about 100 frames or so
      > at 1 fps -- being fired by wired together releases. At 3 frames per
      > sec (JPG) they will stay in sync for at least 25 frames. So I thought
      > I would try spinning the 2 cameras in stereo camera mode ie pointing
      > in the same direction -- at about 8 sec per revolution -- which
      > would be short enough maybe I thought for one 360 in sync for a
      > stereo action panorama.
      > Here is about 180 degrees of a stereo action equi
      > http://www.mediavr.com/chinatownanss.jpg
      > (for crosseye viewing)
      > -- the rest of the pano has crowd blending (mono) stitching issues
      > The sync when it is working is good -- < 2 or 3 msec I think.
      > I think this is a practical idea and stereo action panoramas will be
      > possible with digital slrs (they are certainly possible with film-
      > based stereo panorama cameras but they cant do spherical) if I can
      > build a very solid rotator that will keep the cameras aligned with
      > each other and the rotation axis accurately throughout the rotation.

      I am impressed. The stereo panorama looks fine, so the system is clearly
      viable (if a bit pricey from where I sit...).

      > If you are not worried about sync (ie no action) standard
      > pano methods with a single camera shifted for the 2 views work fine
      > I think with say < 10 degrees rotation per shot if subjects arent
      > closer than 2m say for standard eye separation camera separation.

      I agree; that accords with my (limited) experience.

      > For really accurate stereo panoramas of close subjects with a
      > digital slr I think the strip assembly method I described recently
      > would be better and certainly easier to stitch though longer to shoot.

      Yes, fascinating! Thank you so much for this information. It is a real

      Roger W.

      Work: www.adex-japan.com
      Play: www.usefilm.com/member/roger
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