Difference between revisions of "Rapid Rectilinear"
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| − | A '''Rapid Rectilinear''' [[lens]], or '''RR lens''', is a symmetrical pair of cemented [[achromatic lens|achromatic]] doublets. It was introduced by [[Dallmeyer]] in 1866. At the same time [[Steinheil]] invented a similar construction, the '''Aplanat''' lens. The outer lens elements of the two lens groups are concave [[meniscus lens]] elements, the inner lens elements are convex meniscus lens elements, made of another glass | + | A '''Rapid Rectilinear''' [[lens]], or '''RR lens''', is a symmetrical pair of cemented [[achromatic lens|achromatic]] doublets. It was introduced by [[Dallmeyer]] in 1866. At the same time [[Steinheil]] invented a similar construction, the '''Aplanat''' lens. The outer lens elements of the two lens groups are concave [[meniscus lens]] elements, the inner lens elements are convex meniscus lens elements, made of another sort of glass. This lens construction reduces effectively radial distortion. Dallmeyer's original '''Rectilinear''' wide angle lens's rear lens group is smaller in diameter than the front lens group. The Rapid Rectilinear and the Aplanat each have two equal-sized groups. Steinheil offered a landscape Aplanat, a portrait Aplanat and a wide angle Aplanat. Many makers have made lenses of this design. |
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| − | + | == Links == | |
| − | + | * [http://en.wikipedia.org/wiki/Rapid_Rectilinear Wikipedia article] | |
| − | + | * [http://www.johnloomis.org/eop601/notes/history/rapid/rapid.html Article by John Loomis] | |
| − | + | * [http://i916.photobucket.com/albums/ad6/tamasflexoptics/Petzval/Dagor/Aplanat/aplanat.png Images] of brass-barrel rapid aplanat | |
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[[Category:Lenses]] | [[Category:Lenses]] | ||
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Latest revision as of 03:51, 23 March 2023
Glossary Terms
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A Rapid Rectilinear lens, or RR lens, is a symmetrical pair of cemented achromatic doublets. It was introduced by Dallmeyer in 1866. At the same time Steinheil invented a similar construction, the Aplanat lens. The outer lens elements of the two lens groups are concave meniscus lens elements, the inner lens elements are convex meniscus lens elements, made of another sort of glass. This lens construction reduces effectively radial distortion. Dallmeyer's original Rectilinear wide angle lens's rear lens group is smaller in diameter than the front lens group. The Rapid Rectilinear and the Aplanat each have two equal-sized groups. Steinheil offered a landscape Aplanat, a portrait Aplanat and a wide angle Aplanat. Many makers have made lenses of this design.
Links
- Wikipedia article
- Article by John Loomis
- Images of brass-barrel rapid aplanat
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