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Comments on Gigapan: Calatrava Bridge


Gigapan Comments (3)

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  1. Mike McCaffrey

    Mike McCaffrey (December 15, 2008, 08:05AM )

    Well, I have certainly been there. While shooting at night I was only capturing at 30sec an exposure. It was cold sitting on top of a hill for an hour and a half with this one: www.gigapan.org/viewGigapan.php?id= 12569Well, you certainly are getting a cool effect, so keep going with the photos, and thanks for sharing your process!

  2. Patrick Collins

    Patrick Collins (December 15, 2008, 12:13AM )

    Mike, Yes I did three exposures for each grid frame. A problem with this process is the exposure at street level is very different to that at parapet level. Under the footbridge to the left the three frames exposed at 1/15, 1/30 & 1/60 whereas the upper level of the wall directly above this exposed at 1/6, 1/13 & 1/25. This problem is further added to given the time that it takes to make a complete grid – this one is 11 frames high by 28 frames wide (shot on a Canon G9 at f5.6 and iso200) so the light conditions change over the grid. 308 individual frames at 20 seconds per frame takes 100 minutes without stopping to take additional frames where something or someone has moved in front of the camera. In essence this makes the HDR appearance of the final image worse than it should be and harder to tone down. I am looking at a number of different solutions to this but none are without compromise! One solution to the different light conditions across the image is to take a greater number of bracketed images either by using something like CHDK directly on the camera or have a computer connected and use PSRemote. (both allow you to do bracketed exposures based on shutter speed rather than aperture which makes processing simpler in PTGui). The downside of this is you can end up pushing each frame to take up to 40 seconds…… I guess a camera with a high speed burst mode could be very useful here! It would also be great to have more control on the GigaPan head. I often find that a 30% overlap in the vertical will result in a 50% (or greater) overlap in the horizontal and so a significant saving could be made in the actual amount of images taken. Any suggestions from the pano-community would be greatly received!

  3. Mike McCaffrey

    Mike McCaffrey (November 29, 2008, 10:03PM )

    So how are you managing to get the HDR effect? Are you taking multiple frames at each spot in the grid?