On Monday, 6 February 2017 at 14:46:18 -0800, Paul Hemans wrote: > I have 6 Git2 cameras on a rig. I want to stitch the images together > into an equirectangular view. The ultimate goal being a skybox. I > am using Hugin and I have set the Lens type to Full frame fisheye. > The specs say the GIT2 focal length is f/2.8 and a FOV of 170.
f/2.8 is an aperture, not a focal length. > However, lensfun has it at 5.57 > http://wilson.bronger.org/lensfun_coverage.html No, that's a crop factor, not a focal length. > Is the lensfun focal length the result of the 2.8 x the focal length > multiplier? > https://www.lifewire.com/focal-length-multiplier-for-lenses-493735 No, forget the f/2.8. It's not relevant here. Check your lens again and see if you can find a real focal length, and the you can use 5.57 as crop factor. If you can't find a focal length, and since it's a 170°, set the focal length to 15 mm and crop factor 1. That should be close enough for the control point detectors to align the images. If it's a 360° horizontal panorama, they will then calculate a more accurate focal length, which in my experience is not always what the manufacturer complains (for example, I use an Olympus 8 mm lens, crop factor 2, but the control point detectors are unanimous in saying that it's really 7.7 mm). > Should I use 5.57 as the focal length in Hugin with a multiplier of 1? No, definitely not. Greg -- Sent from my desktop computer. Finger [email protected] for PGP public key. See complete headers for address and phone numbers. This message is digitally signed. If your Microsoft mail program reports problems, please read http://lemis.com/broken-MUA -- A list of frequently asked questions is available at: http://wiki.panotools.org/Hugin_FAQ --- You received this message because you are subscribed to the Google Groups "hugin and other free panoramic software" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/hugin-ptx/20170207030207.GC65698%40eureka.lemis.com. For more options, visit https://groups.google.com/d/optout.
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