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Help identify a set of lenses
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PostPosted: Sat Sep 02, 2017 9:44 pm    Post subject: Help identify a set of lenses Reply with quote

Hello!

I recently received some stranges lenses.
I know where it comes from : Leningrad (GOMZ), made in 1950. But I have no idea what is the purpose of those things. It looks like giant microscope lens.

One a is monocle with 2 lenses in front. Two others have complex optical design (5 or 6 elements inside). I tested the two big (the monocle does not form image), they give pretty good results, like a normal lens (but they are slow lenses naturely). The x20 almost cover FF (vigneting on A7), the x50 cover like a 8mm cine lens.
No diaphragme.

Anyone have idea about the use of those lenses?
I have talked with several friends about it. The main idea is that it is naturely technical lenses. Maybe gauge projection lens.

Here are some photos (before the cleaning, sorry)

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#1


PostPosted: Sat Sep 02, 2017 10:29 pm    Post subject: Reply with quote

It was made by Gosudarstvennyi Optiko-Mekhanicheskii Zavod - GOMZ - and that's all I know. Wink


PostPosted: Sat Sep 02, 2017 10:39 pm    Post subject: Reply with quote

Have they been De-Fused?


PostPosted: Sun Sep 03, 2017 6:49 am    Post subject: Reply with quote

you are in trouble, because you probably know more of soviet lenses than anyone else here Wink


PostPosted: Sun Sep 03, 2017 9:16 am    Post subject: Reply with quote

kansalliskalaCafe wrote:
you are in trouble, because you probably know more of soviet lenses than anyone else here Wink


Well, I hope there is a western equivalent of such things, that someone could know what is was for Smile .


PostPosted: Sun Sep 03, 2017 10:32 am    Post subject: Reply with quote

Possibly from an early Russian industrial measurement / profile projector https://en.wikipedia.org/wiki/Profile_Projector or optical comparator https://en.wikipedia.org/wiki/Optical_comparator?

The magnification range (20x, 50x) would support this idea...

Here some modern such lenses: http://www.bowersgroup.co.uk/row/product-range/optical-measuring/profile-projectors/rh400-087-baty-r400-profile-projector-lens-systems.html

I have one in my collection, Nikon made: http://www.macrolenses.de/ml_detail.php?ObjektiveNr=355

Usually very good, very sharp lenses with VERY LITTLE DISTORTION!


PostPosted: Sun Sep 03, 2017 6:40 pm    Post subject: Reply with quote

Let us know if you find more info, also samples?


PostPosted: Mon Sep 04, 2017 11:47 am    Post subject: Reply with quote

Klaus, thanks a lot for those information, they are convincing! Let's say it's lenses for comparator untill I find further informations Smile

jamaeolus, here are some samples :

x20 on A7






x50 on Nex-3