panorama software,virtual tour software
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Joined: 2004-01-09
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Posts: 17
2004-01-12
#1

Sigma 8mm Fisheye on a Canon EOS 1Ds

Does anyone have any experience using a Sigma 8mm f/4.0 fisheye on a Canon EOS 1Ds.  I've tried a few panos with this equipment and I cannot get Panoweaver to stitch it properly.  Maybe I need to adjust the settings?  Before acquiring the Sigma lens I was using a Nikon Coolpix 5000 with the fisheye adapted and was able to stitch panos without any problems.


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Joined: 2002-04-23
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2004-02-03
#2

As we can see from the pano stitched with 3dvista, it seems that the FOV of the fisheye image is much less than 180, maybe 160 or so. (See image below )

It is quite strange that the image shot with such an expensive SLR camera will has FOV less than 180, since even the fisheye image shot with D30/D60/10D and sigma 8mm has 180 FOV.

If that is true, it can be assue that only 3 photos from 1DS are not enough to create a full spherical image. At 3 (around) + 2 (Nadir and Zenith) photos are necessary to accomplish a full immersive (360??§?180) panorama.


To see is to believe
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2004-02-03
#3

We use the 1ds with 8mm sigma constantly. No problems stitching at all...

But:..... all images are corrected for light fall-off near the edges.

We created a large 'ivercone', pointed the lens towards an overcast sky, and in this way created a standard abberation.

Now, using this image in photoshop as a reverse luminescence mask, we succeeded in creating a 'flatter' image. A photoshop action can be created to automate this feature.

When these images are stithced (3 not 2), we get a beautiful panorama. We even use this technique to create HDR (high dynamic range) images for use in 3D software.


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Joined: 2002-11-23
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2004-02-03
#4

Great!

Where are your samples?

We like to look!

Regards, Smooth


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2004-02-03
#5

guyvdb, would you please share us your source fisheye images and stitched panos?

It is possible that NJGary may use wrong setting when shooting photos. NJGary, do you use "zoom in" or other operations that may cause lower FOV when shooting photos? 


To see is to believe
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2004-02-03
#6
There is no zoom on the Sigma lens!
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Joined: 2003-01-16
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2004-02-04
#7

Have u tried the panotools forum on yahoogroups??? I know that a few guys there use this set up and at least maybe able to assist with some camera/lens questions.

Rob


If I only had an hour to chop down a tree... I'd spend 45 mins sharpening the axe.
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2004-02-04
#8

Rob,

I have looked there and have vertified that the combination of lens and camera should work.  But, I am not up to using Panotools, it is beyond my capabilities, so I'm just waiting for the guys at Panoweaver to figure out what's wrong!

Thanks for your input!

Gary


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2004-02-04
#9
I know what u mean... I like panotools and will havr to get my head around it when I get my SLR... alas... I wish panotools would find an easier solution.... the fiddling around with contorl spots and stuff gives me headaches and extends the workflow no end...
If I only had an hour to chop down a tree... I'd spend 45 mins sharpening the axe.
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2004-02-08
#10

Hey guys,

I stitiched Gary's 3 shots in Panotools. Results are almost (95%) identical to the results gary is getting in 3DVISTA.

One thing I noticed, when i let panotools run the optimizer, it reduces the FOV to about 141. the program feels that with a 141 FOV it gets the best results.  if i force it to 180 FOV i get the correct vertical height but the images dont blend/sticht correctly...is messy.

I believe Gary is also experiencing this FOV reduction when he stitches with 3Dvista.

If you guys have ever experienced this FOV reduction, post some reasons and ways to correct this.

Thanks all!


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2004-02-12
#11

As far as the test with fisheye images shot with 1ds and sigma 8mm by guyvdb, the stitching is just fine. No FOV problem at all.

You may try it yourself. Here are the source images:

http://www.easypano.com/temp/1ds/AADT8097.JPG

http://www.easypano.com/temp/1ds/AADT8098.JPG

http://www.easypano.com/temp/1ds/AADT8099.JPG

Here is the stitched image:

http://www.easypano.com/temp/1ds/pano.JPG

Please note that the image are compressed so the stitched panoramic image is little bit messy, but there is no problem at all in the stitching line.

I wonder whether NJGary use the right lens or not. NJgary, can you find any difference between the images above with yours?


To see is to believe