Difference between revisions of "Fisheye lens"
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| − | Fisheye lenses | + | '''Fisheye lenses''' cover an extremely wide angle and render an image that is very distorted. This contrasts with most lenses, which are designed to minimise distortion. Fisheye lenses project severe distortion away from the image centre: only straight lines that pass through the centre will appear straight. The lenses come in two varieties: circular fisheye lenses, which project a circular 180 degree angle of view image within the film frame; and full-frame fisheye lenses, which fill the frame with 180 degree angle of view diagonally. |
| − | Originally developed for metereological | + | Originally developed for metereological uses, their distortion limits their use in general photography. |
==Origin== | ==Origin== | ||
| − | The term "fisheye" comes from the similarly distorted view of the dry world when looking up from underwater. Because of light refraction when entering water, the image seen of the above water world when looking up from underwater is a circle with extreme barrel distortion at the edges, | + | The term "fisheye" comes from the similarly distorted view of the dry world when looking up from underwater. Because of light refraction when entering water, the image seen of the above water world when looking up from underwater is a circle with extreme barrel distortion at the edges, as via a circular fisheye lens. This is the only way to project a 180 degree image onto a flat plane and the original use of these lenses was photographing cloud cover. |
| − | Full frame fisheye lenses were developed for general photography but the extreme distortion is obvious. | + | Full-frame fisheye lenses were developed for general photography but the extreme distortion is obvious. Jonathan Eastland comments that they are "difficult to use with originality".<ref>Jonathan Eastland, ''The Leica R Compendium.''<!-- publication details? page number?--></ref> |
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| + | ==Notes== | ||
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| + | <references /> | ||
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| + | [[Category:Lenses]] | ||
| + | [[Category:Glossary]] | ||
Revision as of 03:36, 11 February 2012
Fisheye lenses cover an extremely wide angle and render an image that is very distorted. This contrasts with most lenses, which are designed to minimise distortion. Fisheye lenses project severe distortion away from the image centre: only straight lines that pass through the centre will appear straight. The lenses come in two varieties: circular fisheye lenses, which project a circular 180 degree angle of view image within the film frame; and full-frame fisheye lenses, which fill the frame with 180 degree angle of view diagonally.
Originally developed for metereological uses, their distortion limits their use in general photography.
Origin
The term "fisheye" comes from the similarly distorted view of the dry world when looking up from underwater. Because of light refraction when entering water, the image seen of the above water world when looking up from underwater is a circle with extreme barrel distortion at the edges, as via a circular fisheye lens. This is the only way to project a 180 degree image onto a flat plane and the original use of these lenses was photographing cloud cover.
Full-frame fisheye lenses were developed for general photography but the extreme distortion is obvious. Jonathan Eastland comments that they are "difficult to use with originality".[1]
Notes
- ↑ Jonathan Eastland, The Leica R Compendium.
