Hi all,

 As far as I understand, lensfun/ufraw accept vignetting corrections
only for -1=< k_i=<2. I own some old primes lenses with very strong
vignetting wide-open on a full-frame dslr. Using hugin to calculate
the correction values, I often find values not in this range (for
example I found some k2="-2.0").

 Why is lensfun/ufraw limiting the correction range ? Is it a way to
avoid this behaviour ?

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