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| User list | Rules | You are not logged in.
Hi all,
a friend of mine is shooting panos with a Canon 400D and a Sigma 8 fisheye lens, slanted (!). There is one set of images for you to play with ,-). . He is shooting 6 around. When the panos are detected, the result looks like shown in the first screenshot.
When I apply "roll 56" to the whole pano, the result looks much better - second screenshot.
Now, sometimes he shoots up to 15 panos a day. After the panorama detection he would like to judge the previews to see which panos are worth it to process further. And for this purpose it´s a bit nerve wrecking to open every pano in the editor window and apply "roll 56" to every pano manually.
Unfortunately I don´t know a quick solution for his needs, does anybody of you?
Regards, Martin
Last edited by emess (2008-10-02 07:22:14)
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I suggest he abandons his current technique and instead shoots 4 around not rolled/slanted but with a small upwards pitch to ensure adequate cover and blending at the zenith - which it appears he does not achieve with his current rolled shooting technique because he is not also applying a small upwards pitch.Then he will not have to rotate the stitched pano.
This would leave a small square 'hole' at the nadir but with my Nikon DSLR/Sigma 8mm/NN5 combo this is smaller than the rotator of the pano head when using 4-around with an upwards pitch of 5 degrees. It would be a little larger with a Canon DSLR due to the difference in crop factor (1.6 vs. 1.5 for the Nikon) and would require a little more upwards pitch. IIRC Hans Nyberg says 6 degrees upwards pitch is sufficient for adequate zenith coverage on a Canon cropped sensor DSLR with the Sigma 8mm.
It has been demonstrated, by Hans Nyberg, that this rolled shooting technique reduces image quality at the seams in the central/middle area of the pano - see his post in this panoguide.com thread:
http://www.panoguide.com/users/1299/messages/?page=7
The only possible benefit is when one uses a suitable head, camera and lens combination (such as the Agno's MrotatorC for Nikon DX with Sigma 8mm FE) that allows 360x180 coverage in just 3 shots thereby reducing ghosting issues in scenes with a lot of movement, but then the overlaps are very small and this makes stitching more difficult.
Taking 6 rolled shots rather than 4 pitched shots is not worthwhile IMO.
What pano head is he using now? I note that the 6 shots were not taken with even horizontal spacing for some reason.
If he is shooting 15 panos a day then he might wish to consider the 360Precision Atome head which would make his life easier - this is a ring type head with built-in upwards pitch (which other single row ring-type pano heads do not have AFAIK) with a mechanism that allows very easy attachment/removal of the camera/lens from the body of the pano head:
http://www.360precision.com/360/index.c … ainnavID=2
(Be aware that apparently there are different models of the Atome for Nikon and Canon versions of the Sigma 8mm f3.5, I believe this is because the Canon mount lens has an auto-manual focus switch which the Nikon mount version does not).
Last edited by mediavets (2008-10-03 11:30:36)
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