nodal point (optical center) for G3 ?

[pingupingu]

who have information about nodal point for g3 ?

the screw hole under the camera is the nodal point for a special value of zoom ? 7.2, 28.8 ?

thank you.

[trbrogan]

what is a nodal point?????

[pingupingu]

the nodal point is the 'optical center' (i think).
its is the point that you have to turn around to make good panoramas. i know that it varies with the focal of the lense.

http://www.pbase.com/pingupingu

[Keith-S]

Here is one for the G1 I know the G3 is different, but this could maybe help?

[http://forums.dpreview.com/forums/read.asp?forum=1010&message=4615405 (http://forums.dpreview.com/forums/read.asp?forum=1010&message=4615405)

http://tedfelix.com/CanonG1/nodalpoint.jpg

[CowboyPoetWannabe]

That's a great reference, Keith-S. Now, does it vary linearly?

Here's a complex reference to finding the nodal point:
http://www.edb.utexas.edu/teachnet/QTVR/NodalPoint.htm
so if somebody's got the equipment...?
In his shots, there are two images side-by-side. The gray stripe is the lamp post he mentions.

Here's another couple:
http://www.geolit.org/process/nodal_find.htm
http://home.wanadoo.nl/hierzo/Nodal_01.html

I got these using a Google search on
finding nodal point for lens

Try varying the search words. If you get a really good site, post here, please.

-CPW

[BartS]

To find the nodal point is not so difficult. You need to observe the relative shift of to objects w.r.t. to each other when turning the camera.
E.g. some smal object or edge in the foreground and a building in the background.
First you look at the LCD and observe their relative position. Then you turn the camera for the next shot. If you see any shift you're NOT at the nodal point.

The nodal point WILL shift backwards and forwards when zooming out and in, and you'll need to compensate for this.
Try do a search on panoramic head or similar. I've also seen some good homebuilt solutions on the internet (didn't keep the address unfortunately)

If you're looking for good panorama software try Panorama Factory. I shot some panorama just by hand and it managed to stitch them together really good.

Finally, the site www.panoguide.com has a lot of info.

Good luck, Bart

[pukkita]

So, does anybody know where the nodal point is?

[CowboyPoetWannabe]

pukkita wrote:
So, does anybody know where the nodal point is?
About four miles west of Lebanon, Kansas, at 98°35' West 39°50' North.

-CPW