Xenar Typ. D

[monkeymon]

Hello

Does anyone actually know what is this Xenar Typ. D.

I have read several claims, about it being a triplet or reverse tessar.

Ok, it is a reversed tessar... but I notices that so is my regular 150/3.5 Xenar. Air spaced pair is on the rear on both of these lenses. The only difference i see whit my Typ. D Xenar 150/3.5 is that the rear element diameter is larger in the Typ. D.

Maybe it just means it has a larger coverage?

EDIT.

Ok, it seem it is a triplet. I was fooled by the front element, as it looked identical.. but only one element in the Typ.D. And two cemented elements on regular Xenar. Also learned that older Xenars are reversed design.

[Dan Fromm]

https://www.google.com/search?hl=en&as_q=&as_epq=xenar&as_oq=%22type+d%22+%22typ+d%22+%22typ.+d%22&as_eq=&as_nlo=&as_nhi=&lr=&cr=&as_qdr=all&as_sitesearch=http%3A%2F%2Fwww.largeformatphotography.info&as_occt=any&safe=images&tbs=&as_filetype=&as_rights=&gws_rd=ssl

[monkeymon]

https://www.google.com/search?hl=en&as_q=&as_epq=xenar&as_oq=%22type+d%22+%22typ+d%22+%22typ.+d%22&as_eq=&as_nlo=&as_nhi=&lr=&cr=&as_qdr=all&as_sitesearch=http%3A%2F%2Fwww.largeformatphotography.info&as_occt=any&safe=images&tbs=&as_filetype=&as_rights=&gws_rd=ssl

You got to be kidding...

[lecarp]

Well if info at Dan's search is accurate i.e.

Quote Originally Posted by Ole Tjugen
"The Xenar Typ D is not a Tessar at all. They have been reported to be triplets; mine, however, is a reverse Tessar where the rear cell has negative focal length.
They are not sharp when wide open, and do not really become very sharp at any aperture. Great for portraits though, and swirl better than Petzvals."

Your lens must be worth at least a couple grand.:)