Thanks, Kay. I posted a much longer response that has disappeared, but it came down to a big thank you for the excellent information you provided. Your first point about there being no transformation carried out during the stacking operation was a relief, and the technique for measuring the HFOV is a keeper for later reference to be sure.
Thanks again for taking the time and sharing your insights. Terry On Dec 24, 1:41 pm, kfj <[email protected]> wrote: > 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
