Panorama Photography Forums 360 Rage

[Bert]

Of course the 8mm Sigma Fish Eye on a Full Frame EOS, like the 5D, gives a lower resolution then it would on a 1.5 of 1.6 type sensor, such as those on digital Nikons or the EOS 350D or EOS 20D.

Still, its nice to try, and to see if panoramas are somewhat acceptable.

I tried the Sigma 8mm / 5D on my 360P (for the 15mm Sigma) with 3 shots around.

I let PTGui determine the image circle automaticly, and set the yaws fixed to 0, 120 and -120.

Contol points were generated automaticly, but since the overlap is in the most distored area, the lens parameters were not set correctly after optimizing the auto contol points. I made a serie of picures with a large overlap, to determine lens parameters.

A problem with the 8mm on the 5D is that a large part of the 360Precision is visible and this causes darker parts in the overlap to be visible after blending.

I made a transparancy mask to get the 360P out of the way:



With this mask the 3 images blend reasonable, but I didn't correct for light fall-off or color abberation...

It would be best to cut out the actual circle, and then apply light fall-off and color abberation corrections for the optimal results...

I think it was a nice experiment, but the image processing make that after the fast shoot the whole process takes a (too) long time....

And the image quality is not suitable for full screen panos I think...

The maximal resolution is about 5440x2720 pixels....

Here is a (unedited) low res sample:

http://www.360rage.com/view-panorama.php?p=27

If you want to try stitching this yourself, download the 3 jpg's here:

(sorry next time I will clean the lens )

http://www.360rage.com/forumpics/8mm-5d.zip (1926kb)

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[ThomasK]

Hello Bert,
have a look at the pano bracket from Bo Lorentzen at http://www.bophoto.com , together with a small carbon tripod and the Manfrotto piece it's really lightweight (<3kg for 5D, 8 or 15 mm lens, carbon tripod and pano bracket). And since the 15mm Sigma has the same diameter as the Sigma 8mm, you can mount both lenses into the pano beacket.

[Bert]

Ha,

those wooden brackets are nice.....

But I stick to my 360P for the time being.... I rarely use the Sigma 8mm anyway....

[ThomasK]

Going hiking the whole day with a Manfrotto 755, the 360P, camera and 3 lenses is too much for me - otherwise I prefer the big tripod with the 360P.

[mhc1]

Bert,
now I could compare a Sigma pano directly to a Nikon pano.
Are they are in different resolution ?
I found the Nikon 10 as Quicktime and the Sigma as JAVA - versions.

They are not that comparable though but a very big difference is obvious.

[Bert]

Oh, yes big difference...

The Nikon 10.5 wins on the 350D, but the Sigma 15mm wins on the 5D....

And the quality of 350D + 10.5 compared to the 5D + 15mm is sort of similar.... I think...