hi everybody,
Now that the thoby Projection is available in Hugin/panotools I was able to run some tests using my 10.5 on a Full frame camera (5dII) I can say that the thoby is a better match than what we call "circular fisheye". How much better? It is hard to tell, as we don't have a good that measures the goodness of registration between 2 photos (I guess we could use Imagemagick's 'compare', but we need to indicate it to use only the intersection of the mask between the two images). In reality, when one uses a "b" parameter, the differences are small. One thing I am surprised is that I am getting an effective field of view of 141.8 degrees, which translates to a lens of 9.69 focal length, which sounds wider than it should be. But it is consistent with Pierre Toscani's findings (In his excellent document describing the 10.5 at http://www.pierretoscani.com/echo_fisheyes_english.html#fisheye2) who gives it a horizontal field of view of 142 degrees (in vertical mode). But I still need a b correction parameter of 0.04411 (which is not too bad). I would say that proper rotation around the nodal point is far more important than using one projection over the other. The thoby improves slightly the match of photos towards the periphery of the lens, which means more of the original photo can be used. I suspect that most users will not see a major improvement of one over the other. Pierre Toscani mentions that this lens has a slight curve beyond 180 degrees, and I can observe that in my tests. So I recommend to crop the far outside of the image. It might be possible to create a 360x140 pano with 2 photos, thought, but there might be deformations in the area where they meet. Speaking of cropping. Hugin should be programmed to crop images for Thobys in the same way it does it for Circular Fisheye. -- Daniel M. German http://turingmachine.org/ http://silvernegative.com/ dmg (at) uvic (dot) ca replace (at) with @ and (dot) with . -- You received this message because you are subscribed to the Google Groups "Hugin and other free panoramic software" group. A list of frequently asked questions is available at: http://wiki.panotools.org/Hugin_FAQ To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/hugin-ptx
