Focal Length - Revision history

Erik Krause: clarified

2010-03-30T18:42:29Z

clarified

Erik Krause: interwiki linked

2007-11-20T16:27:08Z

interwiki linked

Erik Krause: Prepared for new glossary template

2007-11-17T22:56:28Z

Prepared for new glossary template

WikiSysop: 2 revision(s)

2006-07-13T20:24:36Z

2 revision(s)

WikiSysop: 1 revision(s)

2006-07-13T19:55:18Z

1 revision(s)

Bruno: categorised

2005-11-11T12:20:49Z

categorised

Bruno: categorised

2005-11-11T12:20:49Z

categorised

New page

[[Image:Focal_length.gif|thumb|right|Focal Length]]
For photographic purpose the focal length is a physical property of a lens (or mirror) giving the distance from the lens in which rays of light that fall parallel to the optical axis into the lens are focused to one point. The exact point from which the focal length is measured is the rear [[Nodal Point]] (the location of the 'exit pupil'). This point is located outside the physical lens for common wide angle lenses for single lens reflexe cameras.

For a better definition see Wikipedia: [http://en.wikipedia.org/wiki/Focal_length]

Together with the film or sensor format the focal length determines the image [[Field of View]] which is far more important for panoramic imaging.

Whereas for [[rectilinear Projection|rectilinear]] (normal) lenses the focal length is the same throughout the image for [[fisheyes|fisheye]] lenses it is valid only for the image center.
[[Category:Glossary]]

Erik Krause at 11:26, 29 July 2005

2005-07-29T11:26:51Z

@@ Line 1: / Line 1: @@
 {{Glossary|the physical property of a lens which together with the sensor size determines the [[Field of View]]}}
 [[Image:Focal_length.gif|thumb|right|Focal Length]]
-For photographic purpose the focal length is a physical property of a lens (or mirror) giving the distance from the lens in which rays of light that fall parallel to the optical axis into the lens are focused to one point. The exact point from which the focal length is measured is the rear [[Nodal Point]] (the location of the 'exit pupil'). This point is located outside the physical lens for common wide angle lenses for single lens reflexe cameras.
+For photographic purpose the focal length is a physical property of a lens (or mirror) giving the distance from the lens in which rays of light that fall parallel to the optical axis into the lens are focused to one point. The exact point from which the focal length is measured is the rear [[w:Principal plane|principal plane]]. This point is located outside the physical lens for common wide angle lenses for single lens reflexe cameras.
 For a better definition see Wikipedia: [[w:Focal_length]]

← Older revision		Revision as of 22:56, 17 November 2007
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		+	{{Glossary\|the physical property of a lens which together with the sensor size determines the [[Field of View]]}}
	[[Image:Focal_length.gif\|thumb\|right\|Focal Length]]		[[Image:Focal_length.gif\|thumb\|right\|Focal Length]]
	For photographic purpose the focal length is a physical property of a lens (or mirror) giving the distance from the lens in which rays of light that fall parallel to the optical axis into the lens are focused to one point. The exact point from which the focal length is measured is the rear [[Nodal Point]] (the location of the 'exit pupil'). This point is located outside the physical lens for common wide angle lenses for single lens reflexe cameras.		For photographic purpose the focal length is a physical property of a lens (or mirror) giving the distance from the lens in which rays of light that fall parallel to the optical axis into the lens are focused to one point. The exact point from which the focal length is measured is the rear [[Nodal Point]] (the location of the 'exit pupil'). This point is located outside the physical lens for common wide angle lenses for single lens reflexe cameras.

← Older revision		Revision as of 12:20, 11 November 2005
Line 7:		Line 7:

	Whereas for [[rectilinear Projection\|rectilinear]] (normal) lenses the focal length is the same throughout the image for [[fisheyes\|fisheye]] lenses it is valid only for the image center.		Whereas for [[rectilinear Projection\|rectilinear]] (normal) lenses the focal length is the same throughout the image for [[fisheyes\|fisheye]] lenses it is valid only for the image center.
		+	[[Category:Glossary]]

← Older revision		Revision as of 11:26, 29 July 2005
(2 intermediate revisions by one user not shown)
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	Whereas for [[rectilinear Projection\|rectilinear]] (normal) lenses the focal length is the same throughout the image for [[fisheyes\|fisheye]] lenses it is valid only for the image center.		Whereas for [[rectilinear Projection\|rectilinear]] (normal) lenses the focal length is the same throughout the image for [[fisheyes\|fisheye]] lenses it is valid only for the image center.
−	~~[[Category:Glossary]]~~

@@ Line 3: / Line 3: @@
 For photographic purpose the focal length is a physical property of a lens (or mirror) giving the distance from the lens in which rays of light that fall parallel to the optical axis into the lens are focused to one point. The exact point from which the focal length is measured is the rear [[Nodal Point]] (the location of the 'exit pupil'). This point is located outside the physical lens for common wide angle lenses for single lens reflexe cameras.
-For a better definition see Wikipedia: [http://en.wikipedia.org/wiki/Focal_length]
+For a better definition see Wikipedia: [[w:Focal_length]]
 Together with the film or sensor format the focal length determines the image [[Field of View]] which is far more important for panoramic imaging.

← Older revision	Revision as of 20:24, 13 July 2006
(One intermediate revision by one user not shown)