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Are all Schneider Kreuznach Xenon 50mm f/2 lenses the same..
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PostPosted: Sat Jul 25, 2015 5:02 am    Post subject: Are all Schneider Kreuznach Xenon 50mm f/2 lenses the same.. Reply with quote
So, as the title suggests - are they all basically the same lens no matter which camera they are attached to?
I note that some are interchangeable lenses and on some cameras they are fixed and have leaf shutters.
And further, are the Schneider Kreuznach Xenon 50mm f/1.9 lenses basically the same as the f/2 versions or completely different designs?
Interested to know
Thanks in advance for your help
OH


PostPosted: Sat Jul 25, 2015 9:05 am    Post subject: Reply with quote
looking through theses pages
http://www.klassik-cameras.de/Biotar_en.html
http://www.klassik-cameras.de/Rolleiflex350.html#Xenon
You can see, there was a developing of Tronnier's design over the decades,
f-stops 2, 1.8, 1.5 and as prototypes 1.4 were built.

But I think Xenon in diverse mount for diverse cameras at the same time should have had same optical design.


PostPosted: Sat Jul 25, 2015 9:20 am    Post subject: Reply with quote
No matter it is F2, F1.9 or F1.8, it is a 6e/4g double-gauss design. However, Schneider improve the design/coating over time.


PostPosted: Sat Jul 25, 2015 11:32 am    Post subject: Reply with quote
Thank you Thomas and Calvin.
What about this one with built in shutter?
6e/4g double-gauss design too?



PostPosted: Sat Jul 25, 2015 12:13 pm    Post subject: Reply with quote
duckrider wrote:
looking through theses pages
http://www.klassik-cameras.de/Biotar_en.html
http://www.klassik-cameras.de/Rolleiflex350.html#Xenon
You can see, there was a developing of Tronnier's design over the decades,
f-stops 2, 1.8, 1.5 and as prototypes 1.4 were built.

But I think Xenon in diverse mount for diverse cameras at the same time should have had same optical design.


Having the same design doesn't imply that it hasn't been optimized for a certain use - it often has. Renowned lens makers are known to do that.


PostPosted: Sat Jul 25, 2015 12:54 pm    Post subject: Reply with quote
The lens used on a shutter in your RF may be different to the later SLR lens. It may carry the pre-war design which is 6e/5g from the information here http://photo.net/classic-cameras-forum/00MdtU .


PostPosted: Sat Jul 25, 2015 12:58 pm    Post subject: Reply with quote
In short, no they are not.
Some of them are better than others, but several of them can be considered as equal to each other as well...


PostPosted: Sat Jul 25, 2015 7:15 pm    Post subject: subtle variations Reply with quote
I would be very surprised if an early Xenon had the same glasses and radii as the latest ones. And as the current naming- and brand fetishism took shape, Schneider like the others, started to use the name Xenon for other optical designs.

I am certain that a 50mm 0,95 Xenon for smaller formats is of a different (and more complex) construction than the ancient 50\2 for full frame.

p.


PostPosted: Thu Nov 09, 2017 5:14 am    Post subject: Reply with quote
[quote="calvin83"]The lens used on a shutter in your RF may be different to the later SLR lens. It may carry the pre-war design which is 6e/5g from the information here http://photo.net/classic-cameras-forum/00MdtU .[/quote]

Thank you very much, I was looking for that information. I am experimenting with Retina and Voigtlander ragefinders lenses. There are wonders


PostPosted: Thu Jul 29, 2021 8:18 pm    Post subject: Reply with quote
...

Last edited by Blazer0ne on Tue Feb 22, 2022 5:55 pm; edited 1 time in total


PostPosted: Thu Jul 29, 2021 11:13 pm    Post subject: Reply with quote
The Kodak IIc and IIC Retina models came with a Xenon f/2.8 as standard, but the 50/2 was available as an option. The later IIIc and IIIC came standard with the 50mm f/2 Xenon. These lenses continued in use with Kodak's Retinas, up to (and including) the Retina Reflex.


PostPosted: Fri Jul 30, 2021 2:53 am    Post subject: Reply with quote
...

Last edited by Blazer0ne on Tue Feb 22, 2022 5:55 pm; edited 1 time in total


PostPosted: Fri Jul 30, 2021 9:41 am    Post subject: Reply with quote
Blazer0ne wrote:
Xenon 50mm f2 from the Diax at front and rear element.

#2


Looks pretty low to me - 0.07 mR/h corresponds to 600mR/y. Compare this to the estimated average dose in Switzerland which is about the same (around 6 mSv/y = 600 mR/y, see here on the official site of the Swiss government: https://www.bag.admin.ch/bag/de/home/gesund-leben/umwelt-und-gesundheit/strahlung-radioaktivitaet-schall/strahlung-gesundheit/strahlenexposition-der-schweizer-bevoelkerung.html).

I would guess it's simply from thorium impurities in the lanthanum (rare earth) glass - thus not intentionally thoriated glass.


cooltouch wrote:
The Kodak IIc and IIC Retina models came with a Xenon f/2.8 as standard, but the 50/2 was available as an option. The later IIIc and IIIC came standard with the 50mm f/2 Xenon. These lenses continued in use with Kodak's Retinas, up to (and including) the Retina Reflex.


By coincidence, yesterday I got my first Schneider Xenon f2,0/50mm - this one is from a Retina Reflex:




Blazer0ne wrote:

Below, two different version 50/2 xenons are listed as non-radioactive. The slightly older Diax version of the 50/2 xenon has different glass.

https://camerapedia.fandom.com/wiki/Radioactive_lenses

Schneider Kreuznach Retina-Xenon 50mm f/2.0 (Kodak Retina II)
Schneider Kreuznach Retina-Xenon C 50mm f/2.0 (Kodak Retina IIIC)


This might have to do simply with a purer charge of lanthanum glass (=less thorium contamination).

S
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