ZK LTM 1,5/5cm

Hello!

I have recently received a 1948 LTM ZK 1,5/5cm.
A good lens, even if I had to clean the helicoпd which was full of dry grease and sand... But I have not the tools which allow to have a look at the inside barrel, so I could not check the Zeiss number.
Nevertheless, on doing that, I saw a number (1451) engraved on the focus barrel (front module).

Is it a Zeiss number? For instance, for (286)1451?
Other questions: do all Zeiss and ZK lenses of this period have this short number?
And how many lenses of this type were made?

Two pictures:


http://www.ussrphoto.com/UserContent/15122012_ZK 1,5-5cm 002.jpg


http://www.ussrphoto.com/UserContent/15122012_ZK 1,5-5cm 003.jpg

The second one shows the famous two screws...

Thanks. Amitiйs. Jacques.

Just a photo to be more clear:


http://www.ussrphoto.com/UserContent/17122012_Sonnar 2-5cm.jpg

This "short number" 1713 is engraved on my wartime Sonnar 2/5cm, on the intermediate barrel, on the lower part of the lens (we speak of LTM lenses, not Contax mount ones which don't have this barrel). But this Sonnar is very special: the three numbers have nothing in common (2711193 on the front, (2)936760 on the inside barrel, and 1713 on the intermediate one). It was mounted from spare parts, probably in USSR.

So I found the same type of short number (1451) on my ZK, engraved near the head of the lens. I did not take pictures: I was too busy with the regulation of the rings... So, does this short number usually match the other ones on regular lenses?

Thanks if you know. And even if you don't!

Amitiйs. Jacques.

typical zeiss engraving...

the zk 1,5 is really close to the zeiss 1,5 of the late war years... including the famous 2 screws who are typical of a Zeiss barrel ...

I need to go back searching for rarities, you seem to have more luck than me...




Stephan

Merci, Stephan!
Do you know if this "short number" has something common with the "official" Zeiss number?

it should be the last 4 digit of the serial number...

officially

Stephan

So, this ZK should be the # (286)1451: it seems there is no other place (?) in the Zeiss listing where these four last digits can fit.

All that must be verified, of course. When I will have my spanner and wrench to dismount the lens!

Thanks, Stephan.

The four-digits on the parts of the focus mechanism are different from the optics module. There is probably a number stamped in the rear optics module, that would match the original Zeiss serial number for the name ring.

The number you show: each of the parts of the focus mechanism is stamped with the same number. My 272 block Zeiss lens has a 3-digit number, the ZK has a 4 digit number.

The "real-thing".

The only small difference I find on the ZK and the Zeiss: the 'm' vs 'M' and a black line used for the aperture index of the Zeiss vs a dot on the ZK.

OK.
I have just ordered a spanner wrench to discover the Zeiss number.
Hope all that won't be jammed... My other Sonnars could be unscrewed by hand.

News later!
And my best wishes for Xmas and the New Year!

Amitiйs. Jacques.

oups... sorry, I didn't see that it was a number on the focus mecanism... still it's typical zeiss engraving but not the reference to the serial number.

and Brian is far more compйtent than me for what happens inside a 1,5 sonnar...

Hope to have one day the chance to organise a meeting with Jacques and Brian and our fabulons collection of zeiss classes...

To Brian, you will find a topic concerning a very bizarre partially coated F2 fed S lens that is now Jacques belonging... may be you could give your advice on that too.

Stephan

A meeting is really a great idea, Stephan! Ready to go to Belgium with my camper!
Brian, here is the link about my strange 2/50 Fed lens:
http://www.ussrphoto.com/Forum/topic.asp?TOPIC_ID=813&SearchTerms=Fed,2/50

Amitiйs. Jacques.

The Optics Module of the ZK Sonnar shoud unscrew with a rubber sheet, I use a mouse pad. Sometimes the grease acts like glue, rare- a thin shim gets tangled in the threads. You should not need a spanner to unscrew the optics module to see the rear number. The spanner- I use to remove the namering. Many wartime sonnars, and "might be" some ZK's, have a hidden set screw holding the namering in. If so, thr aperture ring needs to come off.

I documented the procedure for doing a CLA on a Jupiter-3, and adjusting them for the Leica. Also documented converting pre-war Sonnars to Leica mount using a J-3 focus mount. Microsoft Word and Powerpoint, would be happy to provide these- jut PM an Email address to me.

I will revive the Fed thread: but I am guessing someone mismatched the optics.

Thanks, Brian. It's just what I fear: a screw which holds all that. It's the case on my # 293xxxxx Contax mount 2/5cm Sonnar.
But it seems you have not opened any mail box in your signature

Reversedly, if somebody is interested by my datas about Sonnar lenses. It includes all I have seen on the net for 6 months for Zeiss lenses between #2600000 and 3000000. I plan to put a "Russian" version of these datas in the wiki: M marked Sonnars, ZK, BK and Jupiters with verified Zeiss numbers. What do you think about it?

Jacques.

Try again- I had not updated the profile, address was obsolete.

I did not realize that the Private message facility is not active here.