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Hi,
I have a sigma 10 mm f2.8 fisheye. Great lens but in the corners I experience chromatic abberations which also affected my panoramas in a bad way.
As it is only/mostly in the corners I decided to do a test by leaving the tube on that sits between the lens and the normal cap.
The result are circular photos of course.
Feeding them into APP created a much better panorama without chromatic abberations.
I would like to hear opinions. In general, is it true that the center circle of a lens is better? Is APP fine with stitching circular photos?
regards,
Hans Keesom
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HansKeesom wrote:
Hi,
I would like to hear opinions. In general, is it true that the center circle of a lens is better? Is APP fine with stitching circular photos?
Lens: the better (and more expensive) the lens the lesser the CAs - no surprise.
A Nikon 10,5mm on DX and Canon 15mm on fullframe show lesser CAs compared to
a 200.-€ lens and work sharper to the edges.
But usually shooting around f:11 should lower the CAs and increase sharpness remarkably,
APP: my experience says yes!
best, Klaus
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Hi Klaus,
If only the sigma would have been a 200 euro lens..... but that is not what I want to discuss.
I am shooting at f11. The f2.8 is there for when shooting other photos, like indoor partys, so anything but panoramas
On the topic, if we can agree on the center of a lens being better (in general), we might have something we can use effectively. Either by mounting a tube on all the lenses we use for panorama's or masking all photos before being processed by APP. Maybe APP can add an option that will tell it to use only the center circle of the source photos....maybe it already is doing so.
I have set up a test tour of pictures that were made with the 10 mm sigma with tube on. Shot using 3 rows (+55,+5,-45) at 45 degrees intervals so 27 pictures per panorama. See http://hanskeesom.xs4all.nl/panoramas/test/ and tell me if the result is ok.
Best, Hans
Last edited by HansKeesom (2010-08-03 16:00:57)
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Hans: you can do that already:
http://www.autopano.net/wiki-en/action/ … sheye_Crop
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HansKeesom wrote:
Hi Klaus,
If only the sigma would have been a 200 euro lens..... but that is not what I want to discuss.
I am shooting at f11. The f2.8 is there for when shooting other photos, like indoor partys, so anything but panoramas
On the topic, if we can agree on the center of a lens being better (in general), we might have something we can use effectively. Either by mounting a tube on all the lenses we use for panorama's or masking all photos before being processed by APP. Maybe APP can add an option that will tell it to use only the center circle of the source photos....maybe it already is doing so.
I have set up a test tour of pictures that were made with the 10 mm sigma with tube on. Shot using 3 rows (+55,+5,-45) at 45 degrees intervals so 27 pictures per panorama. See http://hanskeesom.xs4all.nl/panoramas/test/ and tell me if the result is ok.
Best, Hans
Some lenses have a "donut" shaped area around the center of the lens where focus is worse than at the edges or in the middle. But usually the center is sharper than the corners (unless of course, you are focusing on something in the corner 
)
Last edited by hankkarl (2010-08-04 00:55:20)
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To DrSlony,
Looks like a great menu but somehow I can't find it. No problem though, as leaving the tube on protects the lens I will leave it on and apply the template while shooting.
To Hankkarl : thanks for the information, so it differs from lens to lens
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HansKeesom wrote:
To DrSlony,
Looks like a great menu but somehow I can't find it. No problem though, as leaving the tube on protects the lens I will leave it on and apply the template while shooting.
Perhaps APP/APG fails to recognise your Sigma 10mm lens as a fisheye?
If so then you should set that manually. Otherwise you will not get a good stitch.
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Found the option. I was looking in the main menu but I had to use the image properties button (the hand pointing on the page below the green play button) of the group of images just loaded. Thanks a lot for improving my skills even more :-)
I found that with the tube on APP automaticly reduces the crop to the circular photo. When using normal photos the circle is around the square photo. Of course one can reduce the circle in APP.
So now I have to choose between keeping the tube on so it can protect the lens and taking the tube of so I have a square photo that might be used on its own... :-)
Last edited by HansKeesom (2010-08-05 15:04:21)
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AlexandreJ wrote:
diamond weighting : a diamond weight on the alpha gives more weight to the pixels in the middle of a picture compared to a pixel near the corner - http://www.autopano.net/forum/p65355-20 … -59#p65355
This new rendering option (available in the alpha 2.5 version only) seems to correspond to your whishes...
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