[ptx] need help about getting parameters for fulla

[Deng Libang]

Hi,

I am trying to correct cta by using fulla, but cannot get the right
parameters.
The result after correct shows little difference. I try both correct f & c
and f,a,b & c.

My parameters are here:
fulla  -r -0.0013514045933680017:
0.0031024187860407408:-0.002181135058253964:1.0005601338173964 \
       -b -0.002639662057573752:
0.004339583696649744:-0.0019104358655632307:1.000194532887474 \
        1.tif



Original tif can be see: http://www.shiweicn.cn/fulla/1.tif (about 17.46M)
Result tif is http://www.shiweicn.cn/fulla/1_corr.tif (about 17.18M)

Can somebody help?

p.s. I am using NIKON D50 and Sigma 8mm fisheye lens.

Thanks.

Denly.
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