PanoTools NG:
Re: Sigma 8 F3.5 and its sharpness
dorindxn 2007-May-16 17:43:28
--- In #removed#, "John Houghton" <j.houghton@...>
wrote:
>
> --- In #removed#, "ptgroup" <ptgroup@> wrote:
> >
> > John:
> > as you said before an Hans also:
> > if your lens is calibrated 2/3 Point are sufficient.
> > But this you have to proof otherwise you need the mentioned
amount
> of
> > points.
....
> In
> effect, the second point prevents rotation of the image into an
> arbitrary position.
>
> The same reasoning applies to all the other images, with the result
> that the fixed anchor image uniquely determines the positions of
all
> the other images. They don't individually have the freedom to take
> up any other position. All can be exactly aligned by adjustment of
> their y,p,r values alone.
>
the distance beetween the points become important when the number is
reduced, maybe the area on which the points are spreaded is all that
matter, after all
Dorin
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