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:
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
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?
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.
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.