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Hi Martin

Only for curiosity:

In the last photo I see the frames to rotate the lenses and obtain the focus, but it is not clear to me whether the lenses consist of a fixed lens group (as in a normal bino) plus a front focusing lens that rotates. Or on the contrary the objective frame moves and rotates the entire set of lenses.

Thank you
Rafael
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>1,5m / Re: O.P.L. GERMAN WW2 ARTILLERY 5 M RANGEFINDER
« Last post by Rodolfo Peirano on January 20, 2019, 08:59:47 PM »
Of course Martin, one should live in a castle  ;) However you are on your way, you have the 4 meters. . . :D

But it's a good documentation. Interesting for me mainly the last image; there are gradations and metallic stripes to partially cover the drum.

No idea for the use
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>1,5m / Re: O.P.L. GERMAN WW2 ARTILLERY 5 M RANGEFINDER
« Last post by Martin Soerensen on January 20, 2019, 08:25:03 PM »
nice one Rodolfo... but who would be crazy enough to get such a big rangefinder  ::)
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Magnification 6x / Re: 2253539 - blc 6x30 with extra objective focus
« Last post by Rodolfo Peirano on January 20, 2019, 08:01:06 PM »
Indeed Neall,

Also in some Zeiss catalog corrective lenses were offered to be placed on the eyepieces (like the filters).

I understand little about the rest of the speech. . .

The 4x adapter to increase the FOV, should have been used to increase the angle of view in order to make the panning (I believe "panning" the correct word to say that you can better follow a fast moving object), but I don't think the distance to focus was very small. What would it be for useful ?  :-\

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Magnification 6x / Re: 2253539 - blc 6x30 with extra objective focus
« Last post by Niall McLaren on January 20, 2019, 07:37:38 PM »
I can't see Zeiss designing military binoculars for people with eyesight problems Rafael - wasn't there minimum eyesight requirements for military personnel? If not, we'd expect to find many binoculars with prescription lenses.

As to switching between focus at close range, with a wide FOV to focus at distance with a narrow FOV was also the function of the 4x adapter for the 10x80 Flakglas  - it's much easier with a mounted binocular than a hand held and no rockets were at extreme close focus. In any case - the objective focus 6x30 doesn't alter the FOV or the magnification... ;)
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>1,5m / Re: O.P.L. GERMAN WW2 ARTILLERY 5 M RANGEFINDER
« Last post by Rodolfo Peirano on January 20, 2019, 06:29:03 PM »
Other images
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>1,5m / O.P.L. GERMAN WW2 ARTILLERY 5 M RANGEFINDER
« Last post by Rodolfo Peirano on January 20, 2019, 06:28:25 PM »
For the fans of big rangefinder, here a artillery 5m rangefinder 24x manufactured by Optique et Precision de Levallois (OPL), Paris for the German army, and subsequently used by the Finnish army (SA mark)

Cheers.
Rodolfo


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Magnification 6x / Re: 2253539 - blc 6x30 with extra objective focus
« Last post by Rafael Chamon on January 20, 2019, 01:17:59 PM »
Another explanation could be that these binoculars are intended for people with strong myopia or hyperopia, because in these cases focusing the target with eyepieces can result in an unfocused reticle. However, focusing with objectives allows to maintain the distance between reticle and eyepiece, and so reticle remains in focus.

Cheers
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Magnification 6x / Re: 2253539 - blc 6x30 with extra objective focus
« Last post by Martin Soerensen on January 20, 2019, 11:49:45 AM »
I would consider the use for coastal artillery positions also as an option, although in 1944 these were diminishing....
the option to switch between focus at close range, with a wide FOV to focus at distance with a narrow FOV was also the function of the 4x adapter for the 10x80 Flakglas. This was produced to enable tracking of rockets „natter“
Was there similar high velocity weapons at coastal positions? V1 for instance..
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Magnification 6x / Re: 2253539 - blc 6x30 with extra objective focus
« Last post by Niall McLaren on January 20, 2019, 09:43:02 AM »
I see what you mean Alex  - the same idea as the Avimo monocular. What I meant was that it would be difficult holding a binocular and continuously focussing objectives (even if it was necessary which I doubt with a 6x30's depth of focus).

In any event -  the best way to continually focus a binocular is by central focus. Once it's adjusted to one's eyes, it's perfect through the range of focus near and far. Having to adjust objectives continuously introduces room for error - one side may be focussed and the other not.  All of which leads me to think it was for a less critical application than being in action - such as Robert's training idea or bore sighting (or checking something that's inaccessible).

To be used in action I'd imagine it would rely on eyepiece focus as the thousands of other KM binoculars did. The small numbers made also suggest a very specific role for the extremely close focus. The war at sea in WW2 was one of increasing ranges and close focus on an artillery binocular seems to be a contradiction - unless it fulfills two seperate roles.... ;)
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