Alexandre
Posts: 38
Location: Thonon-les-Bains, France
Registered: 19 Jun 2006
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Did I shoot properly? (Hanheld nadir related)
Posted: 10 Jul 2007 at 14:23 GMT
updated: 10 Jul 2007 at 14:36 GMT
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Hello Everyone,
I have started to work on this handheld nadir thing, and i was wondering if someone could give me his opinion about the pictures I made. I have some difficulties to assemble the pictures and I was wondering if it's because I didn't shoot correctly.
The files are also available in the NEF format: www.chablinet.com/tests/
Thanks in advance for your suggestions.
Alexandre
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Jurgen Eidt
Posts: 19
Location: United States
Registered: 19 May 2004
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Re: Did I shoot properly? (Hanheld nadir related)
Posted: 10 Jul 2007 at 16:28 GMT
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Hi Alexandre, thats a very narrow space (but hey, they need to be covered!  )
Your camera is not centered on the mount. You can even see the paralax error from the tripod leg and the basket. This is a problem for the 4-6/Z shots.
In this narrow space I would not shot the N on the tripod or handheld.
Your place is static (no moving objects) and you have all the time to measure the position of the camera on the tripod (height and distance from the wall for example). When you shot the 4-6/Z, you can reposition the tripod or any other device to position your camera sideways at the measured position to take the nadir. This way the tripod is out of the way for the N and the alignment is much better than a handhold because you measured the position when you changed the tripod position.
If you have to handhold the nadir, you can optimize the individual shift of the N. This way the wrong position caused by handholding isn't optimized globaly and affect all other shots.
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Eric_Rougier
Posts: 63
Location: Paris, France
Registered: 17 Sep 2005
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Re: Did I shoot properly? (Hanheld nadir related)
Posted: 10 Jul 2007 at 16:42 GMT
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Hi Alexandre,
Do you have all the pictures for this pano ? Just to test..
Regards,
Eric
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Alexandre
Posts: 38
Location: Thonon-les-Bains, France
Registered: 19 Jun 2006
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Re: Did I shoot properly? (Hanheld nadir related)
Posted: 10 Jul 2007 at 20:23 GMT
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Hello Eric,
I am uploading the NEF files to the same folder.
Thanks, Alexandre
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Alexandre
Posts: 38
Location: Thonon-les-Bains, France
Registered: 19 Jun 2006
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Re: Did I shoot properly? (Hanheld nadir related)
Posted: 10 Jul 2007 at 20:33 GMT
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Hello Jurgen,
Many thanks for your advices. When I got the NN3, i followed the recommended settings from the manufacturer for my material (Nikon D50 with a Nikkor 10.5mm fisheye lense) which are 55mm for the horizontal bracket and 80mm for the upper bracket, that why I was seeing those stars at the nadir.
I will take several pics and make panos to find out which one correspond to the right setting.
Cheers, Alexandre
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John Houghton
Posts: 2308
Location: Hitchin, United Kingdom
Registered: 17 Jan 2005
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Re: Did I shoot properly? (Hanheld nadir related)
Posted: 10 Jul 2007 at 20:36 GMT
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Alexandre, Your images aren't difficult to stitch. I stitched the two taken on the head without any problems. (I added alpha channel masks to eliminate the head). I optimized the nadir along with the others, using individual lens parameters. I created two equirectangulars and extracted rectilinear views with PTEditor and merged them in CS2. No big problems, but had to clone a couple of tile edges at the foot of the basket. I think you took the shots quite well. I would be happy with them had I taken them myself. The door needs a little more work, but it's not bad.
John
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Eric_Rougier
Posts: 63
Location: Paris, France
Registered: 17 Sep 2005
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Re: Did I shoot properly? (Hanheld nadir related)
Posted: 11 Jul 2007 at 0:07 GMT
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<Just a few words in french for Alexandre>
Pour avoir moins de travail sur la retouche du nadir, rentre un peu plus les pieds de ton appareil sous la tête et monte un peu la colonne.
</Just a few words in french for Alexandre>
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Oender
Posts: 172
Location: Mexico City, Mexico
Registered: 16 Apr 2007
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Re: Did I shoot properly? (Hanheld nadir related)
Posted: 11 Jul 2007 at 3:28 GMT
updated: 11 Jul 2007 at 3:42 GMT
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Hey Alex, welcome to the forum!! finally your first post here.
Don´t forget to re adjust your D50 to the rotational center of your NN3:
cheers,
 Oender
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Alexandre
Posts: 38
Location: Thonon-les-Bains, France
Registered: 19 Jun 2006
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Re: Did I shoot properly? (Hanheld nadir related)
Posted: 11 Jul 2007 at 8:48 GMT
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Hello John,
Great post, thank a lot! It basically sums up everything I should be able to do. Do you know any place where I can learn this? or Do you teach yourself?
Feel free to email me
Alexandre
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Alexandre
Posts: 38
Location: Thonon-les-Bains, France
Registered: 19 Jun 2006
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Re: Did I shoot properly? (Hanheld nadir related)
Posted: 11 Jul 2007 at 8:55 GMT
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Thanks Eric,
I actually thought about this technique of raising the central post rather than stretching to the maximum the legs of the tripod, when I saw the results of a MOV file i made during my trip to Amsterdam.
Go to www.chablinet.com/tests and open the file drink.mov . I didn't work yet on the Nadir but i noticed that it would be easy to remove (i raised the column to the maximum and stretched only 1 section of the feet).
Regards, Alexandre
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jeffE
Posts: 54
Location: Chicago, United States
Registered: 23 Mar 2007
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Re: Did I shoot properly? (Hanheld nadir related)
Posted: 26 Jul 2007 at 17:23 GMT
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an easy thing to do to help both lining up the hand held shot and to match it later in patching is to make your own "Plum line".
Take any small metal object with a way to tie a string to it ( I used a metal clip with a rotating ring on it from the hardware store ($2~3.00 us) and tied some flexible lightweight string to it. My tripod has a hook on the end of the center post. By hanging my Plum line on the hook until it just touches the ground I place a coin (US Quarter) on that spot. Dead center under the camera.
Whether I do the nadir shot on the tripod - offset - or hand held, the coin gives me a place to center my shot . Then when doing my patch in photoshop I can accurately find the center of my nadir patch. Saves a lot of guesswork.
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