Morten Andersen
Posts: 60
Location: Roskilde, Denmark
Registered: 12 Jun 2006
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Canon 5D, sigma 8mm and Agnos TCP short
Posted: 21 Aug 2007 at 11:38 GMT
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I got this set up with a RingT and I am having problems with finding the right settings. I get a lot of stitching problems.
Please look at www.wideeyes.dk/tours/fullscreen/park/park.html and you´ll see the problems I am experincing.
To find the right NPP I have tested my set up for serveral hours by moving the Ring T back and forward on the tripod. I keep the tripod the exact same place so I can compare the results. But I just can´t get it right. I shoot 4+t
How have you guys manage to find the right NPP? It is driving me craaaaazy!!!
I hope someone can help me.
Best regards
Morten
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Rosauro
Posts: 233
Location: Toronto, Canada
Registered: 15 Dec 2006
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Re: Canon 5D, sigma 8mm and Agnos TCP short
Posted: 22 Aug 2007 at 8:37 GMT
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Hi Morten
I've never used one of these but I had a look at Agnos' web site on their Ring mounts.
According to Agnos' description you shouldn't have to find the settings as the ring is already set up for the specific lens' entrance pupil. So I'm hoping that you got the correct ring for your Sigma 8mm. Did the ring come with a quick guide on where to mount your lens on the ring?
Have you contacted Agnos?
What do you have the ring mounted on?
Rosauro
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Morten Andersen
Posts: 60
Location: Roskilde, Denmark
Registered: 12 Jun 2006
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Re: Canon 5D, sigma 8mm and Agnos TCP short
Posted: 22 Aug 2007 at 14:30 GMT
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Hi Rosauro
Thank you so much for your answer.
You are partially right. Once you have found the NPP you don´t have to worry about that anymore, but you still have to manually find it the first time.
I also asked this question at the easypano forum. Dave came up with a helpfull answer - you and others interested can read it here www.easypano.com/forum/display_topic_threads.asp?...
Thanks again
Best regards
Morten
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John Houghton
Posts: 2265
Location: Hitchin, United Kingdom
Registered: 17 Jan 2005
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Re: Canon 5D, sigma 8mm and Agnos TCP short
Posted: 22 Aug 2007 at 17:21 GMT
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Morten, The tutorial is poorly written and contains some factual errors, but the method is basically quite sound and straightforward. You try different positions in the ring mount until there is no observable parallax when you rotate the lens+camera. The angle through which you rotate the camera should match the yaw increments that you normally use when taking shots for your panoramas. E.g. if you take 4 shots around, check for parallax differences at the -45 and +45 settings (i.e. 90 degrees rotation). What happens at intermediate angles is of no interest.
Once again, I should warn that if you have stitching errors, these aren't necessarily due to parallax and a poorly aligned pano head. It might easily be the case that the stitching is poor. To check that the head is correctly aligned at the entrance pupil (not the principal point or the nodal point as the tutorial says), you just need to take a couple of shots with the camera rotated by 90 degrees (or whatever the normal increment is) and arrange for there to be something close to the camera in the foreground against a distant background. Just check for a change in the position of the near object with respect to the background in the two shots. If there is no movement, the head is correctly aligned. However, the range of movement of the lens within the ring is very restricted, so it is difficult to see how you could be grossly out of alignment.
John
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Morten Andersen
Posts: 60
Location: Roskilde, Denmark
Registered: 12 Jun 2006
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Re: Canon 5D, sigma 8mm and Agnos TCP short
Posted: 24 Aug 2007 at 23:47 GMT
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Hi John
Thank you for your answer.
It is sad to learn that the tutorial itos poorly written. I actually thought that the author was very competent - but I guess that you learn something new every day 
I know it should be straight forward to find the NPP. I set up my equipment at the office. Adjusted the rotator (angnos tcpshort and ringT)and made a test. (4 shots around every 90 degree with my new canon 5d and sigma 8mm) I stitched the panorama and found a misalignment in the zenith. I adjusted the rotator and made a new test. I did this SO UNBELIEVABLE many times that I got frustrating, angry, sad, tired and a whole lof of other things. But no matter how much / or little I adjusted the tripod I would not get it to be accurate........
I have even experienced - on a job for a client - that when I manually inserted additional control points it just got worse.....
I am stitching with panoweaver 5.
I really do not want to believe that it is not possible to do a panorama wihtout stitching errors or with out having to correct them i PS. That is why I posted this thread.
Hopefully someone can advice me how to do better with my set up.
Best regards
Morten
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Rosauro
Posts: 233
Location: Toronto, Canada
Registered: 15 Dec 2006
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Re: Canon 5D, sigma 8mm and Agnos TCP short
Posted: 25 Aug 2007 at 0:22 GMT
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Morten
I recommend trying out PTGUI.
Rosauro
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pixelator
Posts: 17
Location: North Carolina, United States
Registered: 21 Apr 2005
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Re: Canon 5D, sigma 8mm and Agnos TCP short
Posted: 4 Oct 2007 at 20:03 GMT
updated: 4 Oct 2007 at 20:04 GMT
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Hey Morten,
Not sure if you found answer yet? Take a look at easypano.com/Panorama-software-36_244.html#circul...
you should be shooting 2-3 shots not 4.
I tried the link you posted for easypano forum, however it took me to the main forum. See ya over there.
Regards,
Pixel
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Smooth
Posts: 1455
Location: Australia
Registered: 21 Jul 2004
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Re: Canon 5D, sigma 8mm and Agnos TCP short
Posted: 5 Oct 2007 at 17:25 GMT
updated: 5 Oct 2007 at 17:28 GMT
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Just to set things straight.
Panoweaver 5.0 is more than capable of stitching correctly using this set up (if you follow the instructions).
Using the 5D and Sigma 8mm you need to shoot 3 images at 120 degrees (Full Circular). You cannot shoot 2 images at 180 degrees and stitch as there is no overlap. Shooting 4 shots is pointless as 3 shots gives more than enough to cover the sphere (overlap).
You also have the choice of shooting Zenith and Nadir shots making it 3+2 or 3+TB if you like.
You should really never need to set control points with Panoweaver 5.0 Unless the images are lacking objects/features or the image is blown out (very over exposed). Loading three (3) images, stitching and running Smartblend should give you a full 360x180 panorama within 5 minutes.
Setting up the Agnos RingT is pretty easy. Copying the position just from a photograph will be close enough for a near perfect stitch. Fine tuning from there is just slight adjustments. Wouldn't even worry if using PTGui.
Once you have found the NPP you tighten the RingT and leave it in position from that point on. The camera can easily be removed and lens caps put in place for storage. Because the lens is held and not the camera the NPP remains correct.
If it takes more than 20 minutes to find the NPP you are doing something very wrong. More than likely it is the adjustment over the tripod centerline that is out more so than the RingT position. Tilting the camera to point 90 degrees down and using the view finder and the centre focus point to centre the camera over the tripod/panohead centerline is the easiest way to set this up.
When the RingT is locked into the correct position the manual focus is locked tight. So it should be taped at the infinity setting before fitment, and make 100% sure the lens is left in "manual focus mode". Auto-Focus is NOT possible with the RingT.
Regards, Smooth 
www.smooth360.info
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Thomas Krueger
Posts: 63
Location: Genoa, Italy
Registered: 3 Mar 2006
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Re: Canon 5D, sigma 8mm and Agnos TCP short
Posted: 6 Oct 2007 at 6:37 GMT
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As Smooth said, Panoweaver should work fine on this type of images. However, you don't use the whole resolution of your 5D with the Sigma 8mm.
I'm shooting 4 pictures with a 5D, the (shaved) Nikon 10.5 and the PanoBracket from Bophoto.com, mounted on a monopod. The positioning of the monopod is not precise, but the small Monopod Bubble Level from Kaidan helps.
Stitching is done with the latest beta from Autopano, blending with the Smartblend option. The final images have roundabout 4000x8000 px.
en.wiki.autopano.net/Lastest_Beta
You get automatic stitching with no control points, and if you level the monopod carefully the stitching is almost perfect. Sometimes the zenit has to be retouched a bit, or take another image for the zenit to retouch later.
Little retouching helpers:
Adding a nadir cap from Peter Nyfeler: tinylink.com/?SYQ1n93yWu
Photoshop plugin from Rune Spaans: www.superrune.com/technical/software_spheretocubi...
Night shot in the crowd: tinylink.com/?sgDJPNagkH
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