Doug Aurand
Posts: 839
Location: Albuquerque, NM, United States
Registered: 2 Jan 2008
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Initial Settings for PTGui with Sigma 8mm
Posted: 4 Oct 2008 at 16:38 GMT
updated: 4 Oct 2008 at 16:50 GMT
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I'm finally getting a really good stitch on a new set of source pics with PTGui 7.2 without using a template for the first alignment.
The PTGui template Nikos did of the Living Room I shot put me onto checking off some of the Advanced settings in the Optimizer, I checked off;
Horizontal Shift
Vertical Shift
Vertial Shear
I left the Lens Parameters at Automatic/Use EXIF from camera and let the software do the cropping.
John Houghgton is right, I'm getting just a little bit of "saw tooth" on the Nadir using the published rail positions on Nodal Ninja so I need to fine tune the Rail position
But aside from the shadows that moved between the first and last shot of the 4 shots with my Canon XTi & Sigma 8mm, the stich is the best I've ever gotten with PTGui
Why didn't somebody tell me to change the Optimizer setting before.
What other settings do you guys that use PTGui suggest as default or initial settings?
Nikos, thanx so much for giving that PTGui template to practice with
Doug Aurand
Albuquerque, NM
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Doug Aurand
Posts: 839
Location: Albuquerque, NM, United States
Registered: 2 Jan 2008
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Re: Initial Settings for PTGui with Sigma 8mm
Posted: 4 Oct 2008 at 16:49 GMT
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John Houghton
In my "Driving me Crazy" thread you said;
"Looking at the nadir (in a good stitch from PTGui), there is some evidence of a circular saw effect created by the seams. It would have been clearer if the camera had been tilted down a few degrees, to give a fuller view of the centre of the pano head. It looks like the camera might need shifting slightly to the right on the lower rail (as viewed from the back of the camera. Checking the entrance pupil position with a plumb line should confirm this."
The Bottom Rail would move the camera forwards or backwards, did you mean move the the Upper Rail of my NN3 to the right?
Thanx
Doug Aurand
Albuquerque, NM
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mediavets
Posts: 534
Location: Isleham, Cambs., United Kingdom
Registered: 8 Feb 2008
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Re: Initial Settings for PTGui with Sigma 8mm
Posted: 4 Oct 2008 at 17:12 GMT
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No, he meant the bottom/lower rail - viewed from behind the camera movement on the bottom/lower rail moves the camera left or right.
Andrew
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Doug Aurand
Posts: 839
Location: Albuquerque, NM, United States
Registered: 2 Jan 2008
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Re: Initial Settings for PTGui with Sigma 8mm
Posted: 4 Oct 2008 at 17:19 GMT
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Andrew
You and John are right, I was looking at the NN3 without a camera on it and got it turned 90°
Thanx
Doug Aurand
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John Houghton
Posts: 2335
Location: Hitchin, United Kingdom
Registered: 17 Jan 2005
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Re: Initial Settings for PTGui with Sigma 8mm
Posted: 4 Oct 2008 at 17:25 GMT
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Doug, Changing the setting of the lower rail (i.e. the position of the vertical arm on the lower rail) moves the camera sideways. Fore and aft adjustment is via the upper rail setting.
Manual optimization has to be done intelligently; you should check the boxes with some specific aim in mind. There's no reason at all why your digital camera images would suffer from shear distortion, so you should not be trying to correct none existant shear distortion by checking the vertical shear parameter. It might give you some insight as to what is going on if you read through this note on the optimizer. It probably needs updating, but the general description is quite valid:
www.johnhpanos.com/optitute.htm
John
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irieman
Posts: 156
Location: East Sussex, United Kingdom
Registered: 8 Jul 2006
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Re: Initial Settings for PTGui with Sigma 8mm
Posted: 4 Oct 2008 at 17:28 GMT
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Doug
I have always understood that shear settings are for scanned images only so I wouldn't check that. A calibrated lens setting should give you the results that you want. If not use different optimization strategies depending on which lens is being used. For my 15mm FE on a FF 5D I would first run the optimiser with just YPR, second run + fov, third run + b, fourth run + a and c, fifth run + d and e.
For my Nikkor 10.5mm FE on the 5D I would start with YPR, then b, then fov, then a and lastly d and e - NB do not optimise C with this lens. I'm not sure if that is the case with the Sigma but I'm sure that someone will put you right.
Obviously this isn't relevant to your setting of the pano head but a consistent optimiser strategy is essential. Having said that I am very impressed with the way that the auto functions of the latest version of PTGui ( in Mac form for me) work - almost no need to use manual optimisation runs.
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Doug Aurand
Posts: 839
Location: Albuquerque, NM, United States
Registered: 2 Jan 2008
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Re: Initial Settings for PTGui with Sigma 8mm
Posted: 4 Oct 2008 at 18:04 GMT
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John
You're right about not needing the Shear setting turned on.
You being right about PTGui...what else is new 
I stiitched the same set of source photos after turning off Shear and got identical results.
I'll read through the Tutorial and see if I can get a better understanding of the Optimizer
What's really encouraging is the alignment is dramaticly so much better that I feel I can finally offer to do work with my CanonXTi/Sigma8mm/NN3 setup and be confident I can deliver images with just a little touch up in Photoshop
I'm going to go reshoot a condo with spectacular windows that I shot before with the Coolpix5400/FC-E9.
Thanx again guys
Doug Aurand
Albuquerque, NM
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Pete Loud
Posts: 155
Location: United Kingdom
Registered: 14 Oct 2006
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Re: Initial Settings for PTGui with Sigma 8mm
Posted: 4 Oct 2008 at 18:38 GMT
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Every time I come across one of JH's tutorials I think how brilliant it is. This one is no exception.
Pete
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