Dagherrotipo: NFM-lens 1841

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Tipologialogia Equipment
Deeplink: http://daguerreobase.org/it/type/00e41c00-3c11-d931-bc39-ce2d8e7eb75b

Titolo: Petzval portrait lenses
creator: Voigtländer & Sohn
Descrizione: Two portrait lenses designed in 1840 by Josef Petzval and manufactured by the optician Peter Wilhelm Friedrich Voigtländer in Vienna. The lens design allowed much light travel through it allowing for shortened exposure times. This feature was the main reason for it's popularity. It had no built in diaphragm (iris) and the optical brightness was about f/ 3,6, several times brighter than any other competitors' lenses. The numbers engraved here are 135 and 2472. Both lenses in the collection of Preus Museum, Norway. The nr. 135 must have been made very early in 1841 since about 700 were made in the first year of production. The lenses were associated with the highly acclaimed, lightweight, portable Voigtländer daguerreotype camera built entirely of metal. The camera required disc shaped plates 97 mm in diameter in order to fit the plate holder. Some sources mention 94 mm diameter and other larger sizes. These may well have been experimental.
date: 1841-00-00
type: Equipment
Idetificazione: NFM-lens
language: English
rights: PDM

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