Il giorno 31-08-2001 20:46, Ted Oliverio, email@hidden ha scritto:
> On Friday, August 31, 2001, at 10:43 BC, Geoff Jagoe and Barb de la
> Hunty wrote:
>
>> are you talking only fisheyes, or generally? On my 17-35 zoom, the
>> nodal point is well away from the film plane. Also have a look at the
>> picture of the Spheron PanoCam 12F with a fisheye lens on it - the
>> camera is set well back so the lens can be over the point of rotation.
>> See http://www.spheron.com . Two very different cameras but they follow
>> the same rule.
>
>
> See recent (< 5 min ago) post by me -- I misspoke, nodal point is *NOT*
> the film-plane. But the point in my original post stands: neither is it
> the FRONT of the lens-glass. I'm nearly certain you can't have a nodal
> point outside the area limited at one end by the front of the lens and
> at the other end by the film-plane.
>
> Thanks,
> Ted
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For all the listners survived after having red the way Santiago used to
calculate the nodal point (Sorry Santiago:-) here's the procedure i follow
to find that bloo... N point:
1) I frame two objects: a close and a further one on the same vision line.
2) I pan the camera to bring those objects first to the right and - then -
to left of the viewfinder for checking the relative distance.
The more the distance remains costant, the more accurate the nodal point is.
Gianni Maselli
ps: Santiago, did you ever thought to give some serious help to those brave
guys of the SETI project?
