On Tue, Oct 15, 2013 at 07:51:49PM +0200, Stefan Peter wrote:
> The next thing I tried was to manually copy over your control points
> to my pto so I could run the optimization. Much to my horror, a simple
> optimization for "Positions and View (y,p,r,v)" resulted in a focal
> length of 299 mm for the lens.
...
> simply want to create a "wide image" composed from 3 24mm images. I'd
> propose the following:
You should optimize "v" or viewing-angle only if you have a 360 degree
pano.
When you have a 24mm lens, three pictures won't take you all the way
around.
If you'd take something like 18 pictures at 24mm and go all the way
around, the mathematical viewing angle calculated from the 24mm focal
length will differ slightly from the actual viewing angle. This will
make the first and last picture "not fit". To correct for this you
can optimize "v" as well. However this does not make sense to do when
you have only a 90 degree total viewing angle.
Of course, the "difference" will still be there, but it won't
influence the actual pano-sphere that much. Just a little scaling
around the center.
Roger.
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