Talk:Nodal Point - Revision history

Erik: 2 revision(s)

2006-07-13T19:42:16Z

2 revision(s)

Erik: 2 revision(s)

2006-07-13T18:09:21Z

2 revision(s)

Rjlittlefield at 05:32, 24 January 2006

2006-01-24T05:32:12Z

Rjlittlefield at 05:32, 24 January 2006

2006-01-24T05:32:12Z

Chrisbjones at 05:08, 15 May 2005

2005-05-15T05:08:11Z

Chrisbjones at 05:08, 15 May 2005

2005-05-15T05:08:11Z

New page

I think we should be a bit less equivocal in the perennial debate about "front nodal point" versus "entrance pupil".
I had always favoured the front nodal point as the centre of perspective and centre of rotation, but have recently changed my mind.
As David Jacobson's [http://www.photo.net/learn/optics/lensTutorial Lens Tutorial] says, "Nodal points are the two points such that a light ray entering the front of the lens and headed straight toward the front nodal point will emerge going straight away from the rear nodal point at exactly the same angle to the lens's axis as the entering ray had. Certainly one ray of the pencil of rays coming from an object will behave in this way, but this is not necessarily the ray which is heading for the centre of perspective.
On the other hand, all rays which form the image must pass through the aperture stop, which will approximate a point when the lens is fully stopped down. Since the entrance pupil is the front image of the aperture stop, it follows that the centre of perspective is the entrance pupil.
The authoratative view of the late great Rudolf Kingslake that "the entrance pupil of the lens is the center of perspective" is quoted by John Bercovitz in an [http://www.pauck.de/archive/mailinglist/tech-3d/mhonarc/msg00265.html email archive]. Dr Kingslake confirmed this in a personal letter to John Bercovitz, and suggested a practical experiment which confirmed the theory. You can read the relevant passage in "Optics in Photography" using Amazon's "Look Inside!" feature at [http://www.amazon.com/exec/obidos/tg/detail/-/0819407631/ref=pd_ys_pym_a_1/103-3765908-1082228?v=glance Amazon]

← Older revision		Revision as of 05:32, 24 January 2006
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	<p>On the other hand, all rays which form the image must pass through the aperture stop, which will approximate a point when the lens is fully stopped down. Since the entrance pupil is the front image of the aperture stop, it follows that the centre of perspective is the entrance pupil.</p>		<p>On the other hand, all rays which form the image must pass through the aperture stop, which will approximate a point when the lens is fully stopped down. Since the entrance pupil is the front image of the aperture stop, it follows that the centre of perspective is the entrance pupil.</p>
	<p>The authoratative view of the late great Rudolf Kingslake that "the entrance pupil of the lens is the center of perspective" is quoted by John Bercovitz in an [http://www.pauck.de/archive/mailinglist/tech-3d/mhonarc/msg00265.html email archive]. Dr Kingslake confirmed this in a personal letter to John Bercovitz, and suggested a practical experiment which confirmed the theory. You can read the relevant passage in "Optics in Photography" using Amazon's "Look Inside!" feature at [http://www.amazon.com/exec/obidos/tg/detail/-/0819407631/ref=pd_ys_pym_a_1/103-3765908-1082228?v=glance Amazon]</p>		<p>The authoratative view of the late great Rudolf Kingslake that "the entrance pupil of the lens is the center of perspective" is quoted by John Bercovitz in an [http://www.pauck.de/archive/mailinglist/tech-3d/mhonarc/msg00265.html email archive]. Dr Kingslake confirmed this in a personal letter to John Bercovitz, and suggested a practical experiment which confirmed the theory. You can read the relevant passage in "Optics in Photography" using Amazon's "Look Inside!" feature at [http://www.amazon.com/exec/obidos/tg/detail/-/0819407631/ref=pd_ys_pym_a_1/103-3765908-1082228?v=glance Amazon]</p>
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		+	Jaunary 23, 2006. Done. Please see the revised article [[No-parallax point]] and the associated paper linked in it, [http://www.janrik.net/PanoPostings/NoParallaxPoint/TheoryOfTheNoParallaxPoint.pdf Theory of the "No-Parallax" Point in Panorama Photography].

← Older revision		Revision as of 05:32, 24 January 2006
Line 4:		Line 4:
	<p>On the other hand, all rays which form the image must pass through the aperture stop, which will approximate a point when the lens is fully stopped down. Since the entrance pupil is the front image of the aperture stop, it follows that the centre of perspective is the entrance pupil.</p>		<p>On the other hand, all rays which form the image must pass through the aperture stop, which will approximate a point when the lens is fully stopped down. Since the entrance pupil is the front image of the aperture stop, it follows that the centre of perspective is the entrance pupil.</p>
	<p>The authoratative view of the late great Rudolf Kingslake that "the entrance pupil of the lens is the center of perspective" is quoted by John Bercovitz in an [http://www.pauck.de/archive/mailinglist/tech-3d/mhonarc/msg00265.html email archive]. Dr Kingslake confirmed this in a personal letter to John Bercovitz, and suggested a practical experiment which confirmed the theory. You can read the relevant passage in "Optics in Photography" using Amazon's "Look Inside!" feature at [http://www.amazon.com/exec/obidos/tg/detail/-/0819407631/ref=pd_ys_pym_a_1/103-3765908-1082228?v=glance Amazon]</p>		<p>The authoratative view of the late great Rudolf Kingslake that "the entrance pupil of the lens is the center of perspective" is quoted by John Bercovitz in an [http://www.pauck.de/archive/mailinglist/tech-3d/mhonarc/msg00265.html email archive]. Dr Kingslake confirmed this in a personal letter to John Bercovitz, and suggested a practical experiment which confirmed the theory. You can read the relevant passage in "Optics in Photography" using Amazon's "Look Inside!" feature at [http://www.amazon.com/exec/obidos/tg/detail/-/0819407631/ref=pd_ys_pym_a_1/103-3765908-1082228?v=glance Amazon]</p>
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		+	Jaunary 23, 2006. Done. Please see the revised article [[No-parallax point]] and the associated paper linked in it, [http://www.janrik.net/PanoPostings/NoParallaxPoint/TheoryOfTheNoParallaxPoint.pdf Theory of the "No-Parallax" Point in Panorama Photography].

← Older revision		Revision as of 05:08, 15 May 2005
(2 intermediate revisions by one user not shown)
Line 4:		Line 4:
	<p>On the other hand, all rays which form the image must pass through the aperture stop, which will approximate a point when the lens is fully stopped down. Since the entrance pupil is the front image of the aperture stop, it follows that the centre of perspective is the entrance pupil.</p>		<p>On the other hand, all rays which form the image must pass through the aperture stop, which will approximate a point when the lens is fully stopped down. Since the entrance pupil is the front image of the aperture stop, it follows that the centre of perspective is the entrance pupil.</p>
	<p>The authoratative view of the late great Rudolf Kingslake that "the entrance pupil of the lens is the center of perspective" is quoted by John Bercovitz in an [http://www.pauck.de/archive/mailinglist/tech-3d/mhonarc/msg00265.html email archive]. Dr Kingslake confirmed this in a personal letter to John Bercovitz, and suggested a practical experiment which confirmed the theory. You can read the relevant passage in "Optics in Photography" using Amazon's "Look Inside!" feature at [http://www.amazon.com/exec/obidos/tg/detail/-/0819407631/ref=pd_ys_pym_a_1/103-3765908-1082228?v=glance Amazon]</p>		<p>The authoratative view of the late great Rudolf Kingslake that "the entrance pupil of the lens is the center of perspective" is quoted by John Bercovitz in an [http://www.pauck.de/archive/mailinglist/tech-3d/mhonarc/msg00265.html email archive]. Dr Kingslake confirmed this in a personal letter to John Bercovitz, and suggested a practical experiment which confirmed the theory. You can read the relevant passage in "Optics in Photography" using Amazon's "Look Inside!" feature at [http://www.amazon.com/exec/obidos/tg/detail/-/0819407631/ref=pd_ys_pym_a_1/103-3765908-1082228?v=glance Amazon]</p>
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−	Jaunary 23, 2006. Done. Please see the revised article [[No-parallax point]] and the associated paper linked in it, [http://www.janrik.net/PanoPostings/NoParallaxPoint/TheoryOfTheNoParallaxPoint.pdf Theory of the "No-Parallax" Point in Panorama Photography].

← Older revision	Revision as of 19:42, 13 July 2006
(One intermediate revision by one user not shown)