Difference between revisions of "Ernostar"
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m (was no double-anastigmat except maybe one of many variants) |
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| − | The | + | The very basic 4-element Ernostar was Ernemann's variant of [[Gundlach]]'s fast movie-camera lens Ultrastigmat, replacing the inner biconvex element of that [[Anastigmat]] lens with a convex-concave element. This 4-element design was replaced by a five-element construction, replacing that inner element by a cemented 2-element group, giving the Ernostar 1:2.7 known from the [[Ernemann Klapp-Camera]] camera - not one of the best lenses. |
| − | + | The famous fast '''Ernostar''' was also introduced in 1924 as f2.0 lens for the camera Er-Nox, which soon was renamed to [[Ermanox]]. | |
| − | The asymmetric | + | It could be improved to an even faster lens, the f1.8 85mm Ernostar of 1925. In 1925 this was the fastest available [[still camera]] lens. |
| + | |||
| + | The asymmetric [[anastigmat]] was developed by Ludwig Bertele for [[Ernemann]] in a lot of variations, obviously with the ambition to get the best out of four lens-element groups. | ||
| + | {| | ||
| + | !speed | ||
| + | ! | ||
| + | !elements | ||
| + | !groups | ||
| + | |- | ||
| + | |concept | ||
| + | | | ||
| + | |4 | ||
| + | |4 (1-1-1-1) | ||
| + | |- | ||
| + | |1:2.7 | ||
| + | | | ||
| + | |5 | ||
| + | |4 (1-2-1-1) | ||
| + | |- | ||
| + | |1:2.0 | ||
| + | | | ||
| + | |6 | ||
| + | |4 (1-2-2-1) | ||
| + | |- | ||
| + | |1:2.0 | ||
| + | | | ||
| + | |6 | ||
| + | |4 (2-2-1-1) | ||
| + | |- | ||
| + | |1:2.0 | ||
| + | | | ||
| + | |5 | ||
| + | |4 (1-1-1-2) | ||
| + | |- | ||
| + | |1:1.8 | ||
| + | | | ||
| + | |6 | ||
| + | |4 (1-3-1-1) | ||
| + | |} | ||
| + | |||
| + | The final f1.8 version gave the model for the Bertele's [[Sonnar]] which he developed in 1931 for [[Zeiss]], just reducing the number of goups from 4 to 3, which became the characteristics of the Sonnars: Many elements packed in 3 groups, thus reviving the triplet idea as a triple of groups instead of a triple of elements. Somehow the Ernostar as well as the Sonnar must have been quite unsatisfying for the developer since both lenses were featured in a great lot of different constructions. | ||
{{Flickr_image | {{Flickr_image | ||
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|image_by= Abdishev | |image_by= Abdishev | ||
|image_rights= (C) | |image_rights= (C) | ||
| − | }} | + | }}{{br}} |
| + | |||
| + | ==Links== | ||
| + | *[http://taunusreiter.de/Cameras/Biotar_en.html History of fast 35mm and small format film lenses] by Frank Mechelhoff | ||
[[Category:German lenses]] | [[Category:German lenses]] | ||
[[Category:Ernemann]] | [[Category:Ernemann]] | ||
[[Category:1924]] | [[Category:1924]] | ||
Revision as of 09:49, 20 November 2013
The very basic 4-element Ernostar was Ernemann's variant of Gundlach's fast movie-camera lens Ultrastigmat, replacing the inner biconvex element of that Anastigmat lens with a convex-concave element. This 4-element design was replaced by a five-element construction, replacing that inner element by a cemented 2-element group, giving the Ernostar 1:2.7 known from the Ernemann Klapp-Camera camera - not one of the best lenses.
The famous fast Ernostar was also introduced in 1924 as f2.0 lens for the camera Er-Nox, which soon was renamed to Ermanox.
It could be improved to an even faster lens, the f1.8 85mm Ernostar of 1925. In 1925 this was the fastest available still camera lens.
The asymmetric anastigmat was developed by Ludwig Bertele for Ernemann in a lot of variations, obviously with the ambition to get the best out of four lens-element groups.
| speed | elements | groups | |
|---|---|---|---|
| concept | 4 | 4 (1-1-1-1) | |
| 1:2.7 | 5 | 4 (1-2-1-1) | |
| 1:2.0 | 6 | 4 (1-2-2-1) | |
| 1:2.0 | 6 | 4 (2-2-1-1) | |
| 1:2.0 | 5 | 4 (1-1-1-2) | |
| 1:1.8 | 6 | 4 (1-3-1-1) |
The final f1.8 version gave the model for the Bertele's Sonnar which he developed in 1931 for Zeiss, just reducing the number of goups from 4 to 3, which became the characteristics of the Sonnars: Many elements packed in 3 groups, thus reviving the triplet idea as a triple of groups instead of a triple of elements. Somehow the Ernostar as well as the Sonnar must have been quite unsatisfying for the developer since both lenses were featured in a great lot of different constructions.
|
| Ernemann Kinette home-movie camera and professional lens Ernostar f1.8 advertised in one ad. Italy 1925. image by Abdishev (Image rights) |
Links
- History of fast 35mm and small format film lenses by Frank Mechelhoff
