Auteur: Dan Fromm
Date: 18-10-2006 18:51
C'est un objectif de Rodenstock.
Le Vade Mecum dit: "Eurynar This was a major product, 50,000 being sold between 1909-1914. It was a replacement for the Imagonal, in f5.4 and f6.8 and usually 18cm was used for an 13x18cm plate. The product was revised for 1924,with new optics and mounting, and the next two may have started then. The structure in the 1925 B.J.A. is a dialyt, but the designs may have varied. There is no mention of their being convertible, but the Table lists f3.8, f4.0 and f4.5 as if they were one set of Series IV lenses which differed only in aperture. There was no f3.5 in 1925.
...
(d) f6.8. Examples noted have been 240mm, and 475mm for 14x17in. It was a Doppel Anastigmat in 1918 when fitted to the Enolde plate from Korelle.
Thus this was made in 5 speeds and these variations may partly be due to the focal lengths (B.J.A. 1911, p1260). They seem often to be 4-glass type Q16 [4/4 double Gauss], but this seems to be a case where two or three layouts may have been used under the same trade name. Thus a Gauss (Rod009) may have been used for a wider angle version and a dialyt (Rod008) sold for narrower angle lenses. It has been noted as an f6.8 180mm lens. It was continued into the interwar years as Series 1, f6.8 (Gauss); Series 111, f5.4; Series 1V, f4.5, and f3.8. The f4.5 was said to cover 55° and have a dialyt layout. In use it was nice, especially if closed down a little. It was made as 180, 210, 240, 300mm. (Series 11 is not known here.)"
Le VM, c'est un peu confus ici.
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