I'm getting misalignments on every seam, Nodal Point is perfectly adjusted! Autopano gets it right every time.

[David Fürle]

Hello PTGUI community,

I'm a long time user of PTGUI an my panoramic equipment; over ten years now, and have done pretty much everything you can do in that field.

Since Version 11 came out I did not use to be fair. 

My problem is, that I get a pretty sharp misalignment on all my seams in the panorama even though the nodal point is perfectly adjusted. I just again did the method with the tape on the window and there is no parallax error whatsoever when I turn my camera for about 120°.

I'm using a 5D MKIII with a Tokina 10-17 on a Nodal Ninja Head. 

The strange thing is that I get the same misalignments on old panoramas that were done with PTGUI 6 or so and were rendered perfectly back than.

I just tried Autopano and it gets it right every time I load in my test shots. 

It is always a misalignment over the whole vertical seam between the shots. I'm doing 4 shots for the whole 360° slightly tilted upwards.

I attached some screenshots. 

Every help is very much appreciated! 

Best regards!

David

[Chris Hall]

David 

Does anyone have a phone number for PT GUI

Thanks

Chris

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[David Fürle]

 I'm also getting a perfect round Panohead at the nadir when I'm tilting the lens a bit down, so the Nodalpoint should be good. See attached picture.

[John Houghton]

On Wednesday, September 5, 2018 at 8:15:48 PM UTC+1, David Fürle wrote:

 I'm also getting a perfect round Panohead at the nadir when I'm tilting the lens a bit down, so the Nodalpoint should be good. See attached picture.

David, I tried with some old images taken with the Tokina set at 12mm and initially got poor results with V11. I managed to get much improved results by setting the fisheye factor to -0.486.  You might try with that, and/or optimize that parameter to suit whatever focal length you are using. Don't optimize a,b,c at the same time as the fisheye factor. Do either one or the the other.

If that doesn't help, please make available a set of images for download from somewhere (half size jpegs would do).

John

[David Fürle]

Hi John,

thank you so much for your quick response! Changing the fisheye factor did not change anything but after more and more try and error I figured out that PTGUI 11 does not like the two images I take from the nadir (camera ist still in the Nodal Ninja). If I exclude those two images the stitching is pretty perfect. In earlier Versions of PTGUI this was no issue for me. I always include these two extra images to minimize the nadir hole and provide better image quality near the nadir because of the up tilt of my four main images.

My workaround at the moment is to align my four main images first and then add my two nadir images and create Control points for them. In the optimizer i now disable all global lens profile checkboxes as well as the Yaw, Pitch, Roll parameters for my main images. The optimization now lefts my main images untouched (they won't move a pixel). 

I don't know why this is happening, because the nadir pictures are still taken within the nodal point. 

I also read somewhere, that the Tokina is known for misalignments because of its mustache distortion. But it worked always in earlier versions of PTGUI.

So its still somewhat of unsolved ;-)

Best regards,

David

[John Houghton]

On Wednesday, September 5, 2018 at 10:18:36 PM UTC+1, David Fürle wrote:

Hi John,

thank you so much for your quick response! Changing the fisheye factor did not change anything but after more and more try and error I figured out that PTGUI 11 does not like the two images I take from the nadir (camera ist still in the Nodal Ninja). If I exclude those two images the stitching is pretty perfect. In earlier Versions of PTGUI this was no issue for me. I always include these two extra images to minimize the nadir hole and provide better image quality near the nadir because of the up tilt of my four main images.

David, One thing you might try is to export the V11 project to V10 and do whatever is needed to get a good alignment of the nadir images (maybe you might have to confine control points to the floor area).  Then reopen the project in V11 and see what happens then.

John

[John Houghton]

David, In further tests with my images shot at 12mm, I found that reducing the crop circle to around 170 degrees solved my stitching problems.  The outer edge of the image circle was where all the larger distance control points tended to lie.  An automatic stitch then gave a perfect result (which included two -90 nadirs and an offset vp nadir ).  Av cp distance=1.3, Max=3.7. Setting vp optimization for the two down shots further improved the figures to 0.96 / 3.4.

John

[David Fürle]

Thank you so much John! Reducing the image circle reduces the changes of getting misalignments!

I've learned a lot! Thank you!

Best regards,

David