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Thread: Panorama Shot - distortion enquiry

  1. #1
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    Default Panorama Shot - distortion enquiry

    Hi Guys,

    I tried to do a Pano shot yesterday and after stitching up all the pictures, after all the vertical and distortion are corrected by the PTGUI software, i realise that all 4 corners, top and bottom of the picture are left with the "black" area (black canvas/backgroud) especially the bottom part and have to crop away. My question is, what technique to apply to prevent it so that I can have a larger foreground.




    This is the shot, im referring to how do i take the picture properly so that when after stitch up, i do not have to crop so much of the sea away (the picture is left with so little "sea" now). Im fine with a little cropping, I understand that sometimes after some correction, you'll have to crop some part off but not like the picture above i got to crop so much "sea" away. Any advise please? thank you

  2. #2
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    Default Re: Panorama Shot - distortion enquiry

    don't know whether you're talking about this... just trying to help... there's a very good pdf guide on the second link... hope this helps...

    http://reallyrightstuff.com/pano/03.html

    http://reallyrightstuff.com/pano/05.html

  3. #3
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    Default Re: Panorama Shot - distortion enquiry

    Quote Originally Posted by jaRv1s View Post
    don't know whether you're talking about this... just trying to help... there's a very good pdf guide on the second link... hope this helps...

    http://reallyrightstuff.com/pano/03.html

    http://reallyrightstuff.com/pano/05.html
    Hi thanks for helping, but its not what I'm looking for. you know when you correct distortions or straightening pics you will lose pixels and leave the blank areas. My question was more to, how to do I take Pano shots more properly so that when I stitch them up there wont be too much correction to do, as my photo posted above, you would have notice that I dont have much of "Sea" left as they were cropped away after correction.

    thank you!

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    Default Re: Panorama Shot - distortion enquiry

    shoot in portrait setting / getting a wider lens...

  5. #5

    Default Re: Panorama Shot - distortion enquiry

    Shoot in portrait and use lens no wider than 35mm.

  6. #6

    Default Re: Panorama Shot - distortion enquiry

    You need to shoot
    - portrait position to cover as much angle from top to bottom
    - level your shots so as the pano coverage is the overlapped portion

    More Pano tips, read this link
    See my Photo Gallery at the Clubsnap

  7. #7

    Default Re: Panorama Shot - distortion enquiry

    Don't use spherical rotational techniques, but linear pano motion instead. Shoot in portrait mode and avoid very wide lenses.

  8. #8

    Default Re: Panorama Shot - distortion enquiry

    Easy. Take some more photos at the corner.

    More precisely, take one photo in the middle. Take two photos (one higher, one lower) at left and right in the sense.

  9. #9

    Default Re: Panorama Shot - distortion enquiry

    what time did you take this picture?
    D90|10-24mm f3.5-4.5G|70-300mm VR f/4.5-5.6G|18-105mm VR f/3.5-5.6G|35mm f/1.8|SB700|MB-D80

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    Default Re: Panorama Shot - distortion enquiry

    Quote Originally Posted by megaweb View Post
    You need to shoot
    - portrait position to cover as much angle from top to bottom
    - level your shots so as the pano coverage is the overlapped portion

    More Pano tips, read this link
    does it mean that I can take to take even more shots that will overlap each other at least 50%?

    the last time when i tried pano, i took only 3 shots or so and it turn out very bad, the distortion and everything, this time round i tried more shots and its much better compared to last time but the main issue became the top and bottom after some correction.

    Quote Originally Posted by Dream Merchant View Post
    Don't use spherical rotational techniques, but linear pano motion instead. Shoot in portrait mode and avoid very wide lenses.
    hi, thanks but I dont really understand what are those techniques metioned above.. when I take the pano shots, I only pann the camera. I suppose that is spherical rotational technique?

    Quote Originally Posted by desertstrike View Post
    what time did you take this picture?
    if i remember correctly it was taken between about 6-630 pm
    Last edited by byteyou; 3rd November 2009 at 11:16 AM.

  11. #11

    Default Re: Panorama Shot - distortion enquiry

    Quote Originally Posted by byteyou View Post
    does it mean that I can take to take even more shots that will overlap each other at least 50%?

    the last time when i tried pano, i took only 3 shots or so and it turn out very bad, the distortion and everything, this time round i tried more shots and its much better compared to last time but the main issue became the top and bottom after some correction.
    If you have a proper pano head gear, yes you can shoot many shots or layers of shots to stitch with minimum distortion. Of course a good software like Realviz Stitcher can stitch and correct the distortion well.
    See my Photo Gallery at the Clubsnap

  12. #12

    Default Re: Panorama Shot - distortion enquiry

    Quote Originally Posted by byteyou View Post
    hi, thanks but I dont really understand what are those techniques metioned above.. when I take the pano shots, I only pann the camera. I suppose that is spherical rotational technique?
    Byteyou,

    When you move the camera along a fixed axis (tripod head), you will be rotating it. That induces more distortion than compared to moving the entire lens, camera or tripod in a straight line.

    What Megaweb suggested will help greatly, but because special heads are usually very expensive costing hundreds of dollars, many have DIYed these heads very cheaply with great success. http://sg.search.yahoo.com/search;_y...fp&rd=r1&sao=1

    And yes, take many more shots keeping the camera as level as possible to the scene, both above and below the photo ... but in the end, if you keep on adding sky and foreground, you might end up with what looks like a normal wide-angled shot instead of a panoramic shot.

  13. #13

    Default Re: Panorama Shot - distortion enquiry

    Quote Originally Posted by byteyou View Post

    This is the shot, im referring to how do i take the picture properly so that when after stitch up, i do not have to crop so much of the sea away (the picture is left with so little "sea" now). Im fine with a little cropping, I understand that sometimes after some correction, you'll have to crop some part off but not like the picture above i got to crop so much "sea" away. Any advise please? thank you
    you can take a top set of frame

    and bottom set of frame to "fill in the blanks"

    the problem is that you will end up getting a bit of fisheye effect if you have distinct lines in the picture:


  14. #14

    Default Re: Panorama Shot - distortion enquiry

    Quote Originally Posted by Dream Merchant View Post
    And yes, take many more shots keeping the camera as level as possible to the scene, both above and below the photo ... but in the end, if you keep on adding sky and foreground, you might end up with what looks like a normal wide-angled shot instead of a panoramic shot.
    well, but with more pixels.

    sometimes it is also taken with 10mm at 1.5x crop factor, you are going to get a lot more than what you can get with just single frame, no?

  15. #15

    Default Re: Panorama Shot - distortion enquiry

    Actually it would be much easier if TS used an ultra-wide lens that takes in everything that he wants, then crop top and bottom to simulate a pano.

    But not everyone owns a UW or wants to buy one, so stitching with shots taken with lenses with lesser edge/rectilinear distortion would be better - lenses that are less wide is the straight-forward solution if that were the case. If the lense(s) chosen induce barrel distortion (again, usually the wider and ultra wide lenses), there would have to be even more pixel displacement and image degradation during stitching.

    But I believe others are more experienced in this area.

  16. #16
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    Default Re: Panorama Shot - distortion enquiry

    Quote Originally Posted by Dream Merchant View Post
    Actually it would be much easier if TS used an ultra-wide lens that takes in everything that he wants, then crop top and bottom to simulate a pano.

    But not everyone owns a UW or wants to buy one, so stitching with shots taken with lenses with lesser edge/rectilinear distortion would be better - lenses that are less wide is the straight-forward solution if that were the case. If the lense(s) chosen induce barrel distortion (again, usually the wider and ultra wide lenses), there would have to be even more pixel displacement and image degradation during stitching.

    But I believe others are more experienced in this area.
    Hi thx for replying, I think sometimes even an UWA lens might not be able to capture all. I tried to take Pano shots and stitch because the widest i can go is only 18mm on a cropped sensor. I'm thinking what if I get a UWA and it still can't capture the things I wanted to then it will be back to the same thing again. Pls correct me if what I thinking is not right..

    Thanks for all previous advises as well
    Last edited by byteyou; 4th November 2009 at 10:22 AM.

  17. #17
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    Default Re: Panorama Shot - distortion enquiry

    Hmm... learn something from this thread also.

  18. #18

    Default Re: Panorama Shot - distortion enquiry

    Quote Originally Posted by byteyou View Post
    Hi thx for replying, I think sometimes even an UWA lens might not be able to capture all. I tried to take Pano shots and stitch because the widest i can go is only 18mm on a cropped sensor. I'm thinking what if I get a UWA and it still can't capture the things I wanted to then it will be back to the same thing again. Pls correct me if what I thinking is not right..

    Thanks for all previous advises as well
    most times a 10mm with cropped sensor will be able to capture many things in entirety.

    the thing is, you do not really want the resultant "perspective distortion" all the time; 10mm can sometimes emphasize the foreground a lot, i.e. make it a lot more significant than it actually is.. this can result in a bad photograph.

    you are also right that a uwa might not always be able to capture everything, but it definitely is going to allow you to capture more than an 18mm, and this can be a real boon when it comes to capturing panoramic images that you have to stitch.

    for example, this is 4 images stitched together at 10mm.



    i can only imagine how many shots you have to shoot to get this equivalent. not even sure if it's possible - it probably is, but requires a lot more work.

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    Default Re: Panorama Shot - distortion enquiry

    Quote Originally Posted by night86mare View Post

    i can only imagine how many shots you have to shoot to get this equivalent. not even sure if it's possible - it probably is, but requires a lot more work.
    You mean to say that to achieve the same result using 18mm would be much harder right? would shooting at 10mm introduce bad barrel effect/distortion that is hard to correct? the picture of the cityscape was shot at 20mm as the barrel effect at 18mm of my lens is pretty bad. At least the last time when i tried it was bad and I find it hard to correct. Its like building at both ends are warping up in a spherical manner.

    on a personal note, the cityscape picture i took was inspired by you

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