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I'm curious to know which projection you are using for your non-360x180 panos. Spherical Projection, but the panoramas i take are usually only one or two shots high (vertical) and multiple shots across (horizontally), as you may expect, so cylindrical is a suitable (and maybe more appropriate subst...
by KJJones1974
Sat Apr 02, 2011 12:54 pm
 
Forum: Using Autopano Pro / Autopano Giga
Topic: Focal length changes between photo and panorama
Replies: 25
Views: 7833

Thank you all. I think I understand things better now. The algorithm used for the calculation has changed between versions and the calculated focal length figure is largely incidental in absolute terms (and is probably not particulalrly accurate to reality in my handheld shots unless it is a 360deg ...
by KJJones1974
Fri Apr 01, 2011 9:34 am
 
Forum: Using Autopano Pro / Autopano Giga
Topic: Focal length changes between photo and panorama
Replies: 25
Views: 7833

Thank you AlexandreJ. It is clear that I need to take 360deg panoramas (even when i don't need to) if I want to try to extract an 'as accurate as can be expected' focal length (and FOVs). Is the focal length given by APG (in a 360 deg panorama) likely to be at least as accurate as the manufacturer's...
by KJJones1974
Fri Apr 01, 2011 7:42 am
 
Forum: Using Autopano Pro / Autopano Giga
Topic: Focal length changes between photo and panorama
Replies: 25
Views: 7833

Thank you (both) for responding. To confirm - I did not use a panohead, so i am expecting some margin of error in focal length calculation due to this, and (hankarl) your explanation of APP's assumption on the centre of the circle is useful for me to help undersand differences between actual and cal...
by KJJones1974
Thu Mar 31, 2011 8:44 am
 
Forum: Using Autopano Pro / Autopano Giga
Topic: Focal length changes between photo and panorama
Replies: 25
Views: 7833

Hi all, Many thanks for the replies on this original post - these were very helpful. I have just upgraded to Autpano Giga v2.5.0 and the 35mm focal length equivalent that is presented to me after the panorama has been detected and compiled is much higher than I would expect AND than i get for exactl...
by KJJones1974
Mon Mar 28, 2011 4:02 pm
 
Forum: Using Autopano Pro / Autopano Giga
Topic: Focal length changes between photo and panorama
Replies: 25
Views: 7833

Thank you both, Generally, the focal length remains the same throughout the photos/panorama, but sometimes, even though the EXIF data says the focal length is constant between photos (and probably is), the focal length does vary in the 'adjusted focal length'. I guess i then need to make a decision ...
by KJJones1974
Mon Oct 18, 2010 12:31 pm
 
Forum: Using Autopano Pro / Autopano Giga
Topic: Focal length changes between photo and panorama
Replies: 25
Views: 7833

Ok - thank you... so, taking this a step further to my practical application of this: 1. Is the Panorama focal length more accurate than that in the EXIF data? 2. Does the FOV figure in the panorama relate to the panorama focal length (not to that in the original EXIF data)? 3. When the panorama is ...
by KJJones1974
Mon Oct 18, 2010 9:43 am
 
Forum: Using Autopano Pro / Autopano Giga
Topic: Focal length changes between photo and panorama
Replies: 25
Views: 7833

No - definitely Focal length. For example i have some photos taken that (individually) have a (35mm format equivalent) focal length of 52mm in the EXIF data (and 52mm again in the properties section in the groups view of the main interface). When I go through to the panorama editor, the focal length...
by KJJones1974
Fri Oct 15, 2010 2:43 pm
 
Forum: Using Autopano Pro / Autopano Giga
Topic: Focal length changes between photo and panorama
Replies: 25
Views: 7833

Unfortunately no responses yet, so maybe my question can be rephrased... Can anyone explain why the focal lengths shown on the original photographs (in Autopano) are different when shown as a panorama? Is it a way of quantifying how much distortion has been applied by Autpano to allow accurate 'stit...
by KJJones1974
Fri Oct 15, 2010 2:12 pm
 
Forum: Using Autopano Pro / Autopano Giga
Topic: Focal length changes between photo and panorama
Replies: 25
Views: 7833

Focal length changes between photo and panorama

I am a little confused by the change in focal length associated with the photographs ‘pre-stitching’ and when ‘stitched as a panorama, ready to be rendered’. The ‘35mm focal length equivalent’ of the photos is slightly higher when it is part of the panorama (ready to be rendered). I need...
by KJJones1974
Tue Oct 12, 2010 3:03 pm
 
Forum: Using Autopano Pro / Autopano Giga
Topic: Focal length changes between photo and panorama
Replies: 25
Views: 7833

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