Correct Settings on NN5L ? [Archive] - Nodal Ninja Forum

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Spangler
09-18-2008, 12:59 PM
Hi,

I get my NN5L this week and Ive starded to take some shots, but I still see some parallax errors > not too much as before, but still some. Im using Canon EOS 400D + 18-55mm EF-S which is a rubbish. Lower Rail is 47mm and Upper Rail is 89mm according to a official Nodal Ninja settings, which can be found here : http://www.nodalninja.com/nn_settings.html

Im not use about Lower Rail setting, because If I put it on 47mm, the center AF point in my camera is not in the center of NN5Ls "help thing"

My bubble indicator on tripod is in the center and everything seems ok, but the final panorama is in some places wrong. Is this setting ok or Im doing some other mistake ? Im using PTGui.

Sorry for my english and thanks for replys :001_smile:


P.S. I can upload my shots for a spherical panorama if necessary. Lower Rail is set to a 50mm > in this setting the center AF point is in the centerr of NN5Ls "help circle thing" This is how it looks like when I made a panorama without zenith picture (so dont look at it :001_smile:) http://spangler.cz/temp/re/pano.jpg - you can see there parallax errors

John Houghton
09-18-2008, 11:05 PM
While there are obvious stitching errors in your panorama, it is diifficult to say whether these are mainly due to inadequate setup of the NN5 or to poor stitching with PTGui. If you want to know if you have eliminated parallax with your pano head setup, then you must take some shots that are designed to reveal parallax. I.e. you take two overlapping shots exactly as you would for a panorama and arrange for there to be a near object like a stick or a strip of tape on a window with some distant features in the background. Compare the two shots in Photoshop to see if there is any shift of the near object relative to the background. See http://www.johnhpanos.com/epcalib.htm for more details.

By all means upload your images and we can see if they can be stiched any better. My guess is that there is a small amount of parallax but the stitching is mainly responsible for the worst errors.

John

Bill Bailey
09-19-2008, 06:02 AM
I converted your pano to QTVR and judging by the lower rotator you are very close.
If you would like to send me your unstitched images (with photo of your setup) I can better isolate your issues. Like John mentioned many times it's on the software side of things. Send images to me direct - bill[at]nodalninja[dot] com.
thx
Bill

Spangler
09-19-2008, 08:23 AM
Thanks for the support. There are the pictures in original size (~110mb) its possible that Im making some mistakes in stitching in PTGui - Im new in this software, so any tips and quck quides to stitch a spherical panoramas are wellcome - for example. Thanks again.


You can download pictures from here: http://lfs.actual.cz/storage/Spangler/panorama.rar

@Bill Bailey: e-mail is already sent.

Bill Bailey
09-19-2008, 11:35 AM
Thanks for the support. There are the pictures in original size (~110mb) its possible that Im making some mistakes in stitching in PTGui - Im new in this software, so any tips and quck quides to stitch a spherical panoramas are wellcome - for example. Thanks again.
You can download pictures from here: http://lfs.actual.cz/storage/Spangler/panorama.rar
@Bill Bailey: e-mail is already sent.

Hi Mat?j,
Appreciate you sending over the images.
First on the lower rotator it is not centered. It appears the camera was turned a few degrees to the left and not parallel with the upper rail. Also, not that it would make much difference, but you should rotate your camera plate 180 degrees. Doing so will give you a better bite at the camera base.
I did notice your exposure settings are way off. Every exposure in the sequence needs to be "exactly" the same. So if shooting 4 secs and f/11 all shots should be same exposure as well as manual focus set.

Even with that your parallax very minimal so it shouldn't have an effect on stitching. You usually have flexibility of +/- 3mm - and can go even further out but would require a bit more post production work to clean up.

So this brings us to the software.

Using PTGui your pano doesn't stitch correctly with all images loaded. However the stitch is near flawless with only one row. You could try going in and manually setting control points on every image but this could be very time consuming.
I would suggest straightening out the camera, locking exposure and trying another sequence of images to see if it helps your mulitrow stitching.
Let me know how you go on this. And you are welcomed to post another set.
Thanks
Bill

John Houghton
09-19-2008, 12:54 PM
I fared better with PTGui and got not too bad a result, but the zenith shot was clearly inadequate: http://www.johnhpanos.com/panorar.mov. The control points were mostly automatically generated, but I deleted all those between non-adjacent images.

John

Spangler
09-19-2008, 01:28 PM
I fared better with PTGui and got not too bad a result, but the zenith shot was clearly inadequate: http://www.johnhpanos.com/panorar.mov. The control points were mostly automatically generated, but I deleted all those between non-adjacent images.

John
Fantastic! Just one word: "HOW" :biggrin:

Spangler
09-20-2008, 02:06 PM
Well, another try with a new NN5L setup. It looks ok, but I cant still figure it out how to make a good nadir and zenith shot and how to put them into my panorama.

There is a preview of cropped panorama (without zenith and nadir) : http://spangler.cz/temp/photos/panorama_kr.jpg
Zenith was shooted from the floor, because from NN5L there wasnt anything to help the PTGui stitch it right (just white place). Nadir shot is rubbish too, because Ive tryed some hand-held shots and due Manual Focus (which I missed) its a bit out of focus. It will be great if somebody would help me to stitch zenith and nadir and give me some advices how to do that correctly or how to stitch / add correctly these two shots in PTGui or other software.
Anyway I would like to say big THANKS to Bill Bailey and John Houghton for their support. They helped me a lot!

Full resolution photos here (122mb) - including 4 unsuccessful nadir shots :sad: http://lfs.actual.cz/storage/Spangler/VP6.rar


Thanks to all, I really appreciate it.

John Houghton
09-21-2008, 10:05 AM
The nadir images in the downloaded set were in landscape orientation, whereas the rest were portrait. They should be all in the same orientation so they can share the same lens parameters. (The horizontal angle of view is different in portrait and landscape orientations). The zenith shot should have been taken on the panohead along with the others. It can then be positioned with only two control points, or manually using the Panorama Editor window. The y,p,r values are probably known anyway. Usually the zenith is taken by rotating the camera up from the last or first position, so it has the same yaw value as the previous shot. Pitch is 90 and roll is 0. That's enough to position it reasonably well when there are no features.

The poor quality nadir made accurate cp assignment difficult. I used Viewpoint correction to stitch it in with the main images. There were a couple of miinor line breaks, which I edited via PTEditor. I gave the zenith its own fov parameter and positioned it manually, then when it became obvious that it wouldn't blend properly, I output the zeinith separately and merged it in manually, again via PTEditor. The result isn't brilliant, but can be seen at http://www.johnhpanos.com/VP6.mov.

John

Spangler
09-22-2008, 08:49 AM
Thank you, Ill try to stitch it myself next time :001_smile: