Re: Q: Nodal pt for Coolpix990

[Glenn Barry <glenn@xxxxxxxxxxx>]

This is the quick version, prop the camera on a tripod with a bar that
you can slide so that the camera can rotate around a point other than the
tripod socket. As a general rule the nodal point willl be quite forward
of the tripod socket for fisheye lenses.

Now here is the trick, hang something thin directly in front of the camera, am Metal ruler side on is perfect and take a photo, look at it on the computer to check that you can only see the profile, adjust as necessary until that is the case. Now rotate the ccamera and take another photo, keeping the ruler within the field of view of the lens. When the camera is rotating around the nodal point of the lens you will still be seeing only the profile of the ruler, if you can see the sides of the ruler then you have not yet found the nodal point, keep adjusting the the point of rotation until when you rotate the camera only the profile is visible.

Someone else may be able to give some sort of indication as to where the nodal point is located approximately, forward of the tripod socket.

Glenn
 
 

Careysbphoto@xxxxxxx wrote:

> Does
> anyone know how to figure out where the nodal point is for a Nikon
> Coolpix
> 990 with an 8mm fish eye lens?

--
"People are like stained-glass windows. They sparkle and shine
when the sun is out but when the darkness sets in, their true
beauty is revealed only if there is a light within."

Elizabeth Kubler-Ross

Glenn Barry Photography
2/13 Gerroa Avenue
Bayview
N.S.W. 2104
Australia
Ph (612) 9997 3431
Mobile 0415 279 366
E-Mail: mailto:glenn@xxxxxxxxxxx
Web: http://www.acay.com.au/~glenn