Special issues with fisheye lenses - Revision history

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‎Other Links

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‎Types of Fisheye Images: clarified Zenitar.

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 == Other Links ==
-See [http://homepage.ntlworld.com/j.houghton/360tute.htm John Houghton's tutorial] for tips.
+See [http://johnhpanos.com/360tute.htm John Houghton's tutorial] for tips.
 See [http://panopticus.altervista.org/fishlist/fishlist.htm Luca Vascon's FishList] for a complete catalogue of all fiheye lenses.
 For highly technical discussion, see [http://www.pauck.de/marco/photo/stuff/peleng_fisheye/fisheye_performance_comparison/fisheye_performance_comparison.pdf "Fisheye lens designs and their relative performance" (Kumler and Bauer, SPIE 2000)].
 [[Category:Tutorial:Basic need]]

← Older revision		Revision as of 18:07, 21 March 2007
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	For highly technical discussion, see [http://www.pauck.de/marco/photo/stuff/peleng_fisheye/fisheye_performance_comparison/fisheye_performance_comparison.pdf "Fisheye lens designs and their relative performance" (Kumler and Bauer, SPIE 2000)].		For highly technical discussion, see [http://www.pauck.de/marco/photo/stuff/peleng_fisheye/fisheye_performance_comparison/fisheye_performance_comparison.pdf "Fisheye lens designs and their relative performance" (Kumler and Bauer, SPIE 2000)].

−	~~[[Category:Tutorial]]~~[[Category:Tutorial:Basic need]]	+	[[Category:Tutorial:Basic need]]

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 == Introduction ==
-Fisheye lenses and adapters are very popular because they allow full-spherical panoramas to be constructed from just a few images -- as few as 2 or 3, more typically 4-7. Their vast [[field of view]] is achieved by a special mapping of the reality to the flat image. See [[Fisheye Projection]] for details.
+Fisheye lenses and adapters are very popular because they allow full-spherical panoramas to be constructed from just a few images -- as few as 2 or 3, more typically 4-7. Their vast [[Field of View]] is achieved by a special mapping of the reality to the flat image. See [[Fisheye Projection]] for details.
 == Types of Fisheye Images ==

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 See [http://homepage.ntlworld.com/j.houghton/360tute.htm John Houghton's tutorial] for tips.
+See [http://panopticus.altervista.org/fishlist/fishlist.htm Luca Vascon's FishList] for a complete catalogue of all fiheye lenses.
 For highly technical discussion, see [http://www.pauck.de/marco/photo/stuff/peleng_fisheye/fisheye_performance_comparison/fisheye_performance_comparison.pdf "Fisheye lens designs and their relative performance" (Kumler and Bauer, SPIE 2000)].
 [[Category:Tutorial]][[Category:Tutorial:Basic need]]

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 * The third image is '''"full circular"''' fisheye, using an 8mm focal length lens to place its entire 22.08mm image circle within a 36x24mm frame on film.  The usable fov of this image is 180 degrees horizontal and vertical.
-* The fourth image is "'''portrait cropped circular"''' fisheye, using the same 8mm focal length lens, but now with a Canon 300D digital SLR whose sensor size is only 22.7x15.1 mm (crop factor 1.6).  The usable fov of this image is only about 120 degrees horizontal by 180 degrees vertical.
+* The fourth image is "'''portrait cropped circular"''' fisheye, using the same 8mm focal length lens, but now with a Canon 300D digital SLR whose sensor size is only 22.7x15.1 mm ([[crop factor]] 1.6).  The usable fov of this image is only about 120 degrees horizontal by 180 degrees vertical.
 * The final image is a "'''diagonal cropped circular"''' fisheye, using the same 8mm lens and Canon 300D digital SLR, but now tipped so that the diagonal of the sensor is vertical.  The usable fov of this image is about 145 degrees horizontal by 180 degrees vertical.

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 * The first image, for reference, is from a conventional rectilinear wideangle lens. [*]
-* The second image is '''"full-frame"''' fisheye, using a lens with supposed 16mm focal length to fill a 36x24mm frame on film.  The usable fov of this image is about 98 degrees horizontal by 147 degrees vertical. However, the widely used Zenitar 16mm fisheye has only about 82 degrees horizontal and 125 degrees vertical FoV, which suggests that it's actual focal length is slightly more than 17mm.
+* The second image is '''"full-frame"''' fisheye, using a lens with supposed 16mm focal length to fill a 36x24mm frame on film.  The usable fov of this image is about 98 degrees horizontal by 147 degrees vertical. However, the widely used Zenitar 16mm fisheye has only about 82 degrees horizontal and 125 degrees vertical FoV, which suggests that its actual focal length is slightly more than 17mm.
 * The third image is '''"full circular"''' fisheye, using an 8mm focal length lens to place its entire 22.08mm image circle within a 36x24mm frame on film.  The usable fov of this image is 180 degrees horizontal and vertical.

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