Hi David, Yes, for a zoom all geometric distortion, chromatic aberration and vignetting parameters are (in general) a function of focal length. Most zooms e.g. will switch from barrel when wide to pincushion when tele'd. For that matter, distortion parameters also depend on current focal distance as this, too, moves the internal optics.
In all truth: I hate to admit it but I honestly confess I'm a bit on the fence when it comes to using Hugin to do these corrections now a days. On one hand I want to use e.g. LightTable so I can throw my "real" computer's processor at the .CR3 to squeeze the last bit possible out of it. And when I was using a 70D, dcraw (combined with my own high-order chromatic aberration correction code) could often produce an image from a CR *2* that was measurably superior to what came "stock" from the camera. But with an R7, honestly, I find that the improvement - if any - that I can get by "rolling my own" is not enough to be worth it. Canon can measure their lens' geometric, chromatic and vignetting distortion far more accurately than I can, and all I need to do to access those coefficients is go into the menu and click 'yes' on distortion and peripheral illumination correction. -- Erik On Wed, Jul 23, 2025 at 4:34 PM David W. Jones <[email protected]> wrote: > Good afternoon! > > I have five lenses I mostly use. One is a prime, another is a 500mm tele. > > The other three are zooms. > > When calibrating zooms, do I need to calibrate separately for the > different zoom lengths? > > Thanks! > > -- > David W. [email protected] > wandering the landscape of godhttp://dancingtreefrog.com > My password is the last 8 digits of π. > > -- > 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 visit > https://groups.google.com/d/msgid/hugin-ptx/a0101d07-4988-4429-b1e2-27b2ae36b568%40gmail.com > <https://groups.google.com/d/msgid/hugin-ptx/a0101d07-4988-4429-b1e2-27b2ae36b568%40gmail.com?utm_medium=email&utm_source=footer> > . > -- 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 visit https://groups.google.com/d/msgid/hugin-ptx/CADkOXhK9VsXWuWiaN1Zydmoc8n7P7CGGC7Lg_C%3DGJnDpyqnYow%40mail.gmail.com.
