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Archives of an email list on the history of binoculars. - page 44 / 150

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......continued:

From: Forslund@___ne.de

A comment on Mike Simonsens contribution to list 263:

Norinab stopped producing binoculars with their name in the mid 20es, (see Dr. Seeger, Mil. Ferngl. und Fernrohre, second edition p.455). I guess your date 1/7 1925 is correct, however Norinab stayed in business as Swedish agent for Carl Zeiss.

In the Swedish archives from the time of the Second W.W. i have found many letters of correspondence between Norinab and the Swedish military authorities.

In their header Norinab declares that they are agents for the following firms:

Carl Zeiss-Militäroptik-Jena

Zeiss-Aerotopograph, Jena

Nedinsco, Venlo

Anschütz & C:o, Kiel

C. Plath, Hamburg

Gebrüder Andersen, Kiel

Mechanische Werkstätten Neubrandenburg G.m.b.H., Berlin-Britz

Reinmetall-Borsig A.-G, Berlin

Waffenfabrik Solothurn A.-G., Solothurn

Drägerwerk, Lübeck

   --Robert Forslund

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Subject: Cross eyed?

From: Arthur Tenenholtz   tenenholtz<at>adiglobal<dot>com

  Twice this week,  I examined two porro prism binoculars which were cross-eyed:  the left tube had a field of view more to the right than than did the right tube; the right tube field's was more to the left than was the left tube's field..  One failed a quick check for collimation, while the other seemed to be in collimation.   

  I guess that both were collimated by poor workers or by amateurs.  I would imagine that a proper bench test would be include checking the fields of vision as well as collimation.  Although I find it unsatisfactory is there any signifigant effect  on the user of such a glass?  Can it be harmful to the user's eyesight?  Does it effect stereoscopic vision?

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I believe this will reverse the perception of depth; near objects will appear to be distant, & vice versa.  If they are truly collimated, but reversed as described, I don't think there will be eyestrain, but it seems unlikely they would be well collimated.

--Peter

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Subject: Japan

From: Peter Abrahams

  I just returned from a trip to Japan.  I learned much about early Japanese telescopes, and also about Japanese binoculars.  Some of the highlights related to binoculars:

--Meeting list members:

-Tatsushi Nishioka, who brought a very well made binocular viewer for telescopes that he designed & fabricated, using large prisms for two inch eyepieces.  Mr. Nishioka also brought an example of the first Japanese prism binocular, the Fujii Brothers 'Victor' 8 x 20, manufactured circa 1911.

-Hayao Tanabe, whose web site is familiar to many of us:  http://www.cameraguild.co.jp/nekosan/     Mr. Tanabe brought a group of small binoculars to share, including a Teleater 'clone' labeled 'Chitose', and a Nikko 'Capella' Galilean.

  Nishioka & Tanabe met me at the Science Museum in Tokyo, where we saw the famous Nikko 40 x 250, now in storage but seemingly in good condition.

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