Application
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Triotar-Triplet on a Rollei range finder camera
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Projection objektive Patrinast for a 35 mm slide projector by Ed. Liesegang; 1:2.8/85
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Projection objective Maginon by Wilhelm Will, Wetzlar, 1:2.8/100
The triplet soon became a standard in lens design still used with low-end cameras today. The main optical manufacturers often further developed the original Cooke triplet (e.g., the Zeiss Triotar) that were produced for many decades.
Binoculars as well as refracting telescopes often use triplets. The same holds for many projection lenses, e.g., for 35 mm slide projectors.
A similar design is used in the strong focusing synchrotron, invented first by Nicholas Christofilos in 1949, but his work was not known in the U.S., where parallel development took place.
Read more about this topic: Cooke Triplet
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