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Re: 'Sea Bear's' binoculars

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Posted by Mike Field on June 06, 2018 at 17:20:15 user mikefield.

In Reply to: Re: 'Sea Bear's' binoculars posted by Peter Hyland on June 06, 2018 at 01:33:01:

Thank(s), Peter. :) I did a google search for images of Old Binoculars as a result of your comment. Of all the photos that came up (dozens), all the straight refractive ones (telescopic? -- I forget the correct name) seemed to have focussing knobs in the middle, half-way along the barrels. And all the true (prismatic) binoculars had them where I would have expected to see them, also in the middle but closer to the eye-pieces. It looks like the purpose in all cases is to move the eye-piece tubes in and out so as to adjust the focus.

There were however a couple of pairs (including a correct-vintage pre-war Zeiss) that more-or-less fit the 'Sea Bear' description, with the focussing knob at the front of the instrument. Frustratingly though, I still can't work out how the damn' knob works.... Surely it controls the eye-pieces? But how? It only seems to be fastened to the body....


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