Now that you mention it, the lens is marked "250" with the units left to the reader to determine as an exercise.Quote:
Originally Posted by xkaes
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Now that you mention it, the lens is marked "250" with the units left to the reader to determine as an exercise.Quote:
Originally Posted by xkaes
Fortunately, lots of people have provided additional, and corrective, information -- over the years -- to update the information on the website.
Their motto appears to be: It's better to light a candle than curse the darkness.
the tessars in 250mm focale were not meant to cover 8x10, and for a very dumb reason: 8x10 was not a normalized and common format in Europe.Quote:
Originally Posted by Vaughan
Original format was by pure coincidence the size of the plates used by Niépce and Daguerre (back then given in transitional post-Revolution French inches). Improvements in lenses had photographers use plates a bit bigger, and in order to normalize the market, a Congrès International de Photographie help for first time in august 1889 in Paris at the occasion of Exposition Universelle, discussed of what dimensions to be set as "normal". At this time (1889) French inch was finally phased out by metric system. The Congrès decided to adopt 18x24 as "normal", there was a discussion about subdivisions, and in fact 18x24 was already common:
https://i.postimg.cc/fM5LWxyz/couverture.jpg
http://www.bibliotheque-numerique-ci...notice/?i=7461
in the PDF file pages 16 and 19:
http://www.cineressources.net/consul...b/o000/063.pdf
Le 6 août 1889, le Congrès était ouvert au Trocadéro .../...
Les diverses questions préparées par le Comité d’organisation et le Congrès sont les suivantes :
.../...
6° question. — Format des plaques et papiers photographiques pour faciliter l’emploi des appareils de projection. photographiques.
https://i.postimg.cc/nnnrtdHS/16.jpg
then 3 pages after, the report tells the decision to this question, while mention of usual formats at the time is made:
Pour la grandeur des plaques le Congrès a décidé que la plaque normale serait
le 18x24, les formats deviendraient alors :
.... /... la série actuelle qui est de :
30X40 24X30 18X24 13X18 9X12
https://i.postimg.cc/vQBm4cxW/19.jpg
already in use, 18x24 was deemed to be the normal format. There are no 4x5, 5x7,8x10 British inches there.
you know the reference site about a technical history of central German photographic industry (Jena, Dresden, Görlitz): zeissikonveb.de. It has a good page about Tessar.
A brochure of 1902 with the first f6.3 Paul Rudolph design. Check the correspondance focale<->format: 255mm - 16x21 , 300mm - 18x24
https://impro.usercontent.one/appid/...164&quality=85
sometime a redesign in f4.5 become common, and one of the late DDR brochure from 1987: 210mm - 130x180, 250mm - 130x210, 300mm - 180x240
https://impro.usercontent.one/appid/...524&quality=85
the common ones were 210 (13x18) and 300 (18x24), also has shown in their adoption by the state standard mass USSR production. They made in Tessar design 210 and 300, nothing in the middle.
For 8x10 a 300mm is needed, but it is a different beast. Here three Tessars I have: 210, 250, 300. The 250 is the Fujinon cells stacked:
https://i.postimg.cc/NYXZQpVt/IMG_2636_m.jpg https://i.postimg.cc/HdCRnbDy/IMG_2635_m.jpg
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note that there are VARIATIONS already in the Shanel-5A. I mentioned it with sources on another thread. Front thread M62x1 or M65x1Quote:
Note that the Shanel 5A shutter has a larger front thread than an a 5B or 5B-S.
I am buying Japanese 250mm Tessar for use with whole-plate. Here my recent Okuhara with the Fujinon 250 in Shanel-B:
https://i.postimg.cc/tXsjfy5p/Okuhara_Shanel-5_m.jpg
in fact I didn't want to buy the Fujinon-250. I was just buying the shutter, but like often on Yahoo Japan and Mercari, it was sold together. Back then I had a 13x18 camera and a 8x10 I used with 18x24 sheets, so I was using Tessars I already had in 210 and 300.
Now that I have decided whole plate is the ideal format for my needs, I am looking at "normal" lenses for it, ie.~250mm and this on Japanese market places, because there, another story, and now I am tired of referencing/sourcing, for another reason, the combo whole-plate/half-plate was the norm with these British derivated wooden cameras.
And barrels because I don't want to carry lenses with their respective shutter and board, nor screw/unscrew cells
We feel your pain.
If you are looking for shuttered tessars in longer focal lenghts and less weight i.e. 5.6, 6.1, 6.3,, then you’’ll find out that european market is almost empty with unfrequent Xenar offerings.Quote:
Originally Posted by landstrykere
I’m using Bausch Lomb and Wollensak series IV.
I hope you’ll show your shots with Rectar & Fujinar