On 24 Dez., 21:32, tbransco <[email protected]> wrote: > My first post here, so greetings everyone and best wishes for the > holiday season. > > I'm hoping to get some suggestions for how to estimate or calculate > the HFOV parameter used throughout Hugin, but more particularly for > the align_image_stack tool. > > I shoot some of my macros with an Olympus E-system DSLR fitted with > two adapters, one or more extension tubes, and a reversed 50mm manual > lens, so it's not immediately obvious to me what HFOV the tool would > be best run with, nor how precise I must be to get good results. Any > help would be appreciated.
What macros do you do? If you want to make focus stacks, the HFOV doesn't matter much: you go in and out rectilinear and no transformation takes place. Use a rule- of-thumb value. On the other hand, if you were making macro panoramas, which is a bit more unusual, you can do a 360 degree panorama, start with some estimate for the HFOV and optimize for fov, then take the value you get after optimizing. It doesn't sound like your setup is for panoramas, though... You can also meaure the value, if you know where your NPP is. Take a picture of, say, a horizontal ruler and take a reading of how many cm of the ruler fits in your image. Let that be w, and d the distance of the ruler from your NPP. If v is your horizontal field of view, you have w / ( 2 * d ) = tan ( v / 2 ), so v = 2 atan ( w / ( 2 * d ) ) Kay -- 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
