47306Re: What is the actual Field of View?
- Jan 6, 2011Some lenses eg. the 10.5mm Nikkor on full frame can give you a good stitch with a fairly wide range of fov because of the magnification effects of a, b and c eg. from 190 to 200. So I usually force the optimizer to accept a fov of 196 and an a of -0.16 until towards the end of the optimisation process. Only after I iterate point pair elimination and get the error average down to 3 or 4 pixels do I start to optimise fov and a, b and c generally. But for many purposes a wide fov range of values might look ok with that lens.
--- In PanoToolsNG@yahoogroups.com, Erik Krause <erik.krause@...> wrote:
> Am 06.01.2011 21:18, schrieb engstrom_henrik:
> > This gives a nominal hfov of 56.3 deg, not 57.5. It is still not
> > exactly the same as the measured 55.5, but closer. The difference in
> > focal length has dropped to 1.7%, compared to the previous 4%.
> The datasheet states a certain amount of barrel distortion, which
> changes the actual FoV compared to the theoretical value you get from
> focal length.
> > I have considered using zoom lenses so one can fine-tune the hfov
> > before mounting them. But the zoom lenses I have seen have so much
> > more lens distortion then fix focal lenses so this will be a last
> > resort.
> Will the images of this lenses actually be stitched using one of the
> panotools based stitchers (hugin, PTGui...) or will they be used
> otherwise? Panotools lens correction model can very well deal even with
> strong and unusal distortions. See
> http://wiki.panotools.org/Lens_correction_model for details.
> Erik Krause
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