Finding NPP without a pano head

[nick fan]

See here for finding NPP without a pano head.

http://michel.thoby.free.fr/Banknotes_intro.html

Also see attached images for my old experiment.

The setup.


Test Target

Find the tripod mount. Draw (use pencil, removable marker or a tape) a line
parallel to rear screen, assuming perpendicular to lens axis.

Draw a long line on large paper, and place the camera on paper aligning
the lines on paper and camera base,

Put the target pn paper, move to show up on screen of camera.

rotate taget so that 2 blades overlap as one line. Mark the blade positions on paper.

Repeat with a few more positions

all lines should converge to a point which is the entrance pupil or NPP.

[Hugh]

Great method from Michel, much easier than using a laser.