On 13 Okt., 18:36, Bernd Hohmann <hohm...@harddiskcafe.de> wrote:
> On 13.10.2010 11:54, kfj wrote:

> Reverting to full frame fisheye and reoptimizing v+a,b,c created fine
> output.
>
If you just use 6 around and sky, you cannot expect to generate
reliable a, b and c data. They will depend on your (insufficiently
distributed) CPs, and the optimizer tries to make the best of it. You
must calibrate the lens with data which are fit for a calibration -
20-30 shots, static scene, indoor, ceiling and wall content, panorama
head - these a.b.c and v values you can use for an actual landscape
6+2 take (do make a nadir shot as well). Only reoptimize for v,d,e and
NOT for a,b,c with the 6+2 landscape. If you don't have reliable
calibration data, it's better to work with a=b=c set to 0 or try to
use someone else's data, but you need the stereographic setting.

> At least for my outdoor landscape (means: ground , horizon, sky) 360°
> panoramas.
>
I do it all the time, landscapes with the Samyang 8mm 6 around 1 up 1
down, I know it works.

with regards
KFJ

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