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right hand side ocular, and there is this "sticker" which is the well known black-yellow symbol for radioactivity.As long as the tritium remains contained inside the binocular, there is no harm. If the tube is damaged, the tritium is released and could potentially be inhaled, but the amount is less enough and I won't worry about that. Since the half-life time is only about 12 years, and those EDFs were produced 20 years back, the glow has become a little dim by now. I can see it only in the night, when the eyes are well adapted to low light.      Best regards, Holger

Re: Zeiss radioactive EDF

Posted by Holger Merlitz on 11/28/03

The EDF was in fact available in both versions, from the very beginning. There were original NVA manuals for both models. But it was designed so that that adding or removing the illumination could be easily done. In fact, a civilian version was also issued, without tritium, reticle and IR detector, but they are rare nowadays; probably they were too expensive for most peoble. As you have mentioned, the tritium was removed after unification, because it did not adhere to West-German environment-laws. So whatever EDF is issued today from the Bundeswehr-Depot, is without tritium.     Best regards, Holger


Japanese binocular identification   Posted by Edward on 12/10/03

I have a pair of Japanese binoculars with the symbol of the Kokura Arsenal (four cannonballs). Also marked 6X and no.481. Did Japanese arsenals also produce binoculars?



Binocular List #281: 27 December 2003


It has been quiet lately, but I heard from Hans Braakhuis <hans.braakhuis@___.nl>, who is continuing to expand his listing of Nippon Kogaku binoculars - please contact him if you can help; I'm not sure anyone from the list has added to his work (which will be freely available when completed).  Also, the first known example of the Univex plastic body prototype binocular from WWII was sold recently.  Plans are proceeding for meetings in Tucson and Germany in 2004.  I hope to meet many list members at these.  I will be in Atlanta, Georgia Jan. 3-8; if there are list members there, perhaps we can meet.  I will send out another list before I leave (if I get any email).  2003 has been a very productive year for our subject, and I expect 2004 will be even better.  Please keep working on those lists, papers, articles, books, collections, web sites, etc. - it is a lot more interesting to collect & study something when there is a body of knowledge for background.         --Peter


Subject: P-61 binocular

From: fantao@___t

Bonnie at Caltech was kind enough to make the drawings Russell Porter made of the P-61 night binocular available on the web:


Search for "RWP4.2" and you should get the two drawings.

I believe the first shows the binocular in both the active and stowed positions (swung to the side).  Binocular list readers, please observe the usage rules (only for personal, noncommercial use, remember to include credit line to Caltech Archives), we do not want to abuse the generous service they provide.  I hope to dig up more images for my presentation at the Tucson meeting.


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