2012/11/29 Greg 'groggy' Lehey <groog...@gmail.com> > Partially. The 9 mm has: > > Horizontal FOV: 87.73° > Diagonal FOV: 100.49° > Vertical FOV: 71.68° > > I don't have a formula for fisheyes, so I can't give the output of my > program, but I'm told that it has 180° on the diagonal. Being a > fisheye, this *should* mean (on a 4:3 aspect ratio) a horizontal FOV > of 144° and a vertical FOV of 108°. That's a long way from the 9 mm. > There can indeed be a big difference between a 9mm rectilinear lens and an 8mm fisheye lens, even if 9 doesn't sound that far from 8. It's also possible to have fisheyes from different vendors with different mm, even if they are all fullframe or circular.
> I also get the same results whether I select "full frame fisheye" or > "circular fisheye". What's the difference? > I find it weird that it gives the same result... A fullframe fisheye gives you an image corresponding to the biggest rectangle (because your sensor is a rectangle) in a circle, that's why the diagonals are 180°, but horizontal and especially vertical won't be as much. A circular fisheye will give you the biggest circle on your rectangular sensor. So you'll see a circular image with 180° in all directions, but around that circle you'll have black part, because no light ended up on those parts of the sensor. Theoritically, with a circular fisheye, you could only need 2 pictures, while with a fullframe you'd need a few more. -- 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 hugin-ptx@googlegroups.com To unsubscribe from this group, send email to hugin-ptx+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/hugin-ptx
