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Focal length of the panoramic image

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Gabor Sch
Unregistered guest
Posted on Saturday, June 11, 2005 - 5:05 pm:   Edit PostDelete Post

I admit the subject sounds strange, to say the least, but I do have a reason to ask this.

I am creating quite large panos, many of them over 100 megapixel; the largest is, as of now, 150 megapixel.

I like Panorama Factory, but it is useless if I want to create multirow panos.

There are other products doing that, but I try to save the effort to learn working with several tools only because of a franction of the cases.

So, I am trying to circumvent the single-row restriction. I create two separate panos from two rows, and then I stitch these together (sidewards, of course, which again is a pain in the butt - Panorama Factory should offer at least so much as vertical stiching).

However, the result of stitching is not satisfactory. Perhaps I will post another subject with a particular problem, but the first one is the focal length specification for the two panos resulting from the first two stitchings.

What should I specify here?

I suspect, that all the pano stitching software don't care the least for the focal length but for the angle of view (I guess the focal length will be transformed to an angle of view of a pixel).

Should I calculate the angle of view of the resulting pano (from the first stage) and transform that into a focal length? Does it matter if I start with the diagonal or vertical or horizontal view? I mean, these three yield to the same result on the original image, but this may not be true on the pano, due to warping.

A further problem with this is the cropping, which changes this relationship.

OR: should I take the angle of view of the original pixels and transform that in an imaginary focal length for the pano?

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