Optique Meyer Citoplast

[Georgesh]

Bonjour, je cherche des infos sur une optique Hugo Meyer Doppel-Anastigmat Citoplast, montée sur une chambre 9 X 12 obtu Derval )

165 mm de focale, ouverte à f/6,3

probablement Gauss symétrique, mais je n' en sais pas plus.
( à Görlitz, chez Hugo Meyer and Co). une formule qui pourrait avoir donné le Dagor.

[Gwy]

Bonsoir,
Vu ça :

CONTESSA - NETTEL
Contessa-Nettel was a German camera maker incorporated into Zeiss Ikon in 1926. Prior to this they usedtrade names such as Nettar (a Triplet) and Sonnar which were used after the merger, but others werediscontinued. Those discontinued included:Citonar, Teronar, Citoplast, Tessaplast from Dr Staeble, Conastigmat (a triplet) and Hellaplast. It is notknown if any of these were made in-house, but Frerk says H. Meyer Gorlitz and C.A. Steinheil of Munichsupplied Citonar, Conettar, Augonar and Teronar lenses.Examples are:Nettar Frerk refers to this as the f6.8 and very like the Novar- which may be an informed guess at identity! It isprobably always a triplet.Conettar f6.8 This is mentioned by Frerk, and may be a German- sold version.Citonar f6.3 75mm on Duchessa 4.5x6cm, and stereo, It was a Dialyt. It was also made as a f4.555mm on Steroco Stereo in 1924.Citonar f4.5 Convertible This was noted as a convertible in B.J.A. 1925, p685 on a Duroll plate and filmcamera where it was more expensive than the f6.3 Citonar but less than Sonnar or Tessar. Convertibles at f4.5were unusual and this just may be a Dogmar but today there is no easy way to test this. The same unusualfeature has been noted in several other imported brands of that time and may suggest a common source.Sonnar The Sonnar was fitted in B.J.A. 1925, p684 to the Cocarette rollfilm, the Duroll plate/film, Picolette VPand the 'new' Tessco 3.5x2.5in plate. It was typically a medium price version, with the Zeiss Tessar above it inprice. Thus on the Duroll there were:Citonar f6.3 £6.90-8.90 varying with the shutter.Citonar f4.5 Convertible £10.00Sonnar f4.5 £10.87Tessar f6.3 £13.87Tessar f4.5 £15.00Sonnar was noted as an f4.5/135mm at No105,34x in a dialset Compur on a 1/4plate Sinclair Unar. Also asNo117,86x in dialset No857,714 as a separate lens. It seems to be Q15 type, 1+1+i+2. The example seenseemed an attractive quality item, but is definitely not a Tessar. The front diameter is slightly smaller than af4.5/135mm Tessar, and the external curves differ. It was used on the Sonnar plate for 9x12cm and ?6x9cm,and is post 1919 as the dialset Compur is marked Contessa-Nettel (They merged in 1919 and No857,xxx is alate shutter to be used on a pre-Zeiss Ikon shutter, ie in production at the time of the merger in 1926.)Dominar f4.5/5cm This was noted as No760,64x on a VP size Contessa-Nettel camera.Nostar f6.8 DialytAugonar f6.0 DialytTeronar f5.4 DialytColorplast 60mmConastigmat f6.3 135mmFig 009 018 Contessa Nettel Conastigmat f6.3/135mm in Derval shutter; and Dollond Owl f4.5/4in in Compur.Isoplast f5.8, f6.8 used about 1910 on Contessa cameras No32, 722, 23, 533. It was one of the lower priceoptions and was from Dr Steable.It was partnered by Tessaplast f5.5, Medioplast f7.5/f7.7 from the samesource.Acro f11 This was a low price lens, probably a meniscus, on the Piccolette in 1925.Piccar This was a low priced lens also on Piccolette, listed in B.J.A. 1924, p696, but above the Acro in price:thus it may have been an RR. Prices with Acro, Piccar and Nettar f6.3 were resp. £1.75, £2.00, £3.25 whilewith Tessar f4.5 it cost £12.00.

Edit :

Amusant, toutes les formule double anastigmat trouvées semblent ramener à celle de Goerz

http://books.google.fr/books?id=OJrJrEJ ... at&f=false

[suaudeau benoit]

probablement Gauss symétrique, mais je n' en sais pas plus.
( à Görlitz, chez Hugo Meyer and Co). une formule qui pourrait avoir donné le Dagor.

Très probablement un Gauss, mais certainement pas un ancêtre du Dagor mais un descendant, car le Goerz Dagor sort en 1892 et c'est le premier anastigmat double gauss à 6 lentilles à être fabriqué industriellement (1 ans avant le Zeiss Protar à 6 lentilles).

[Georgesh]

Merci pour vos réponses, L'optique Citoplast semble donc utilisée par Contessa-Netel AG, de Stuttgart, mais Hugo Meyer est indépendant de Contessa-Nettel.
Ces maisons , Contessa-Nettel, ainsi que Ica et Ernemman, ont été rachetées par Zeiss, pour former Zeiss-Ikon en 26.
Hugo Meyer, de Görlitz a continué ses productions , y compris après WW2, où il a intégré le VEB-Pentacon.

D' où vient la longue citation concernant Contessa-Nettel?

[suaudeau benoit]

Ton appareil ressemble à un Contessa-Nettel Onito fabriqué de 1919 à 1926 en deux format en 9x12 et en 10x15. Trois types d'optiques (Citonar 6.3, Nostar 6.8 et Nettar 4.5) 135mm et 165mm en fonction du format. Trois type d'obturateur Derval 25-100 , Gautier 1-100 et Ibsor 1-100.

[Georgesh]

Merci, je pense effectivement qu' en fin de production, il y a eu des montages plus ou moins équivalents , peut-être des écoulements de stocks au moment de la création du holding Zeiss-Ikon.

[Gwy]

D' où vient la longue citation concernant Contessa-Nettel?

A Lens Collector's Vade Mecum (Wilkinson et Glanfield)

[Georgesh]

Merci, la référence des collectionneurs anglo-saxons. Très intéressant