View Full Version : CZJ Tessar f7,2 17,5cm
alexvaras
20-Nov-2018, 09:54
Hi all,
Finally I got this lens, I already dated it, it's from 1909-1911.
But being a f7,2 is the most intriguing fact.
I read a lost of old documents, english and french mainly but all the references for Tessar are f6,3, f4,5, etc.
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Anyone can add info about it? Is it like a transition lens from Zeiss double-anastigmat?
Confirmed the presence of two lenses at the front and a double-cemented at the back.
Thank you,
Alex
Dan Fromm
20-Nov-2018, 12:57
Alex, the Tessar is an asymmetrical anastigmat. It was CZJ's primary general purpose lens until after WW II. Not transitional.
CZJ's Ser. III Anastigmat was an f/7.2 four elements in two cemented groups lens, but it was discontinued before 1900.
Y'r lens may be in a small shutter that limits the maximum aperture.
alexvaras
20-Nov-2018, 13:21
The aperture at the Koilos shutter is 7,2 as well. It could fit another lens before this.
Until when Koilos did shutters? I will try to read about Koilos.
Dan Fromm
20-Nov-2018, 14:04
You could unscrew one of the cells and measure the shutter's aperture's maximum diameter ...
Steven Tribe
20-Nov-2018, 14:54
This air brake model of the Koilos was introduced in 1907 and it looks like it disappeared in 1910, leaving the Compound alone as an air brake shutter.
As Dan said, the lens aperture is limited by the max opening of the Koilos shutter. Your shutter should be no.2 with 25mm opening.
alexvaras
21-Nov-2018, 05:00
At home I will measure the shutter max opening later, lens is from 1909 as I read in Zeiss Historica - Spring 1999 - page 15.
If Koilos was still on business (as Steven says) then it fits, it could be from another shutter yes but the lettering says 1:7,2 pretty clear but no catalog I read so far mention any lens like this.
Dan Fromm
21-Nov-2018, 07:26
Even in those days CZJ was a merchant lens maker, sold lenses to camera manufacturers. Special versions like the OP's f/7.2 Tessar weren't always cataloged for sale to the, um, general public.
OP, look for the lens in camera catalogs, not in CZJ lens catalogs.
alexvaras
21-Nov-2018, 11:14
The narrowest diameter is 24,21mm where the shutter blades come and go, the thread lens diameter is 30mm.
Dan, what does OP mean? I only know OverPowered acronym from online games and I don't think this is the case.
Dan Fromm
21-Nov-2018, 11:40
The narrowest diameter is 24,21mm where the shutter blades come and go, the thread lens diameter is 30mm.
Dan, what does OP mean? I only know OverPowered acronym from online games and I don't think this is the case.
Original Poster. That's you.
alexvaras
22-Nov-2018, 01:15
Thank you Dan, I will search on camera catalogs, it is going to be a long search :)
Rick in CO
27-Nov-2023, 19:42
Just found this thread; I have a 17,5cm Zeiss Tessar Nr. 123488 in a 1-1/200 Compound shutter with marked apertures f7.2-50, no serial number, but circa 1909-1910 according to the early photography website.
As the Original Post indicates, I have found no listing reference.
alexvaras
28-Nov-2023, 23:47
Thank you for sharing your lens.
Btw,’mine it’s not a real Tessar 4/3 design but a triplet 3/3. Rear lens is only a single element.
Rick in CO
29-Nov-2023, 20:33
Thank you for sharing your lens.
Btw,’mine it’s not a real Tessar 4/3 design but a triplet 3/3. Rear lens is only a single element.
Amazing. Just checked mine and you are correct. Still time for a lawsuit?
alexvaras
1-Dec-2023, 00:40
Someone here with more knowledge can say that lenses with f/7.2 are 3/3 triplets and with f/6.3 are 4/3 Tessars, if I recall I read it somewhere.
I don’t complain about my lens, I love it.
If anyone can point out the early years of Tessar for reading, I will appreciate it.
Thank you.
Rick in CO
2-Dec-2023, 09:28
[QUOTE=alexvaras;1698176]Someone here with more knowledge can say that lenses with f/7.2 are 3/3 triplets and with f/6.3 are 4/3 Tessars, if I recall I read it somewhere.
I don’t complain about my lens, I love it.
If anyone can point out the early years of Tessar for reading, I will appreciate it.[/QUOTE
Yes, I would be interested in that info as well.
The earlier f7,2 Zeiss Anastigmat was a very different lens.
I bought this lens out of curiosity, to put on a vintage Linhof camera.
My comment about the lawsuit was frivolous, however I wonder if the original purchaser knew what they were getting?
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