Rare viewfinder, E.Leitz.

[Leicapasion]

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Visor poco común, E.Leitz.  ¿Alguna referencia? ¿Código?

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[alan mcfall]

Related to these Leitz devices of mine?  Reportedly for reading maps, war time. As yours has mirrors to extend eye spacing, it would seem to be some other type of viewer. Can you show it as it would be assembeled?

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[romanus53]

look both like stereo-viewers for some photogrammetric use, maybe to examine stereo aerial pictures; Zeiss made such things afaik but Leitz? new to me.

[willeica]

1 hour ago, romanus53 said:

look both like stereo-viewers for some photogrammetric use, maybe to examine stereo aerial pictures; Zeiss made such things afaik but Leitz? new to me.

I agree. There were early stereo viewers like this such as the Wheatstone Reflecting Stereoscope described by Howard Grubb in 1879 - see attached page from his address with a drawing of how the device worked.

Wheatstone Reflecting Stereoscope .pdf

 In Leicapasion's photo above the writing in German on the left says "Mirrors must not be touched due to the silver plating on the surface". Are there mirrors in the set?

If it is a variant of the Wheatstone device it is interesting to see a design from the 1830s being made and used perhaps 100 or more years later. 

William 

 

Edited July 26, 2024 by willeica

[romanus53]

https://www.catawiki.com/de/l/85590889-leitz-spiegelstereoscoop-stereoskop maybe this will help

 

[Leicapasion]

9 hours ago, alan mcfall said:

¿Tiene algo que ver con estos dispositivos Leitz míos? Supuestamente, para leer mapas, en tiempos de guerra. Como el tuyo tiene espejos para ampliar la distancia entre los ojos, parecería ser otro tipo de visor. ¿Puedes mostrarlo tal como estaría montado?

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Another viewer with Leitz Montur 4x20 binoculars.

[willeica]

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53 minutes ago, romanus53 said:

https://www.catawiki.com/de/l/85590889-leitz-spiegelstereoscoop-stereoskop maybe this will help

 

That is it, but the basic design originated in the 19th century. I will send this thread to a friend of mine who is an eminent optical scientist and also a keen stereo photographer. Last year he received the RPS Progress Award for his work on optics. I will revert with his comments. 

William  

[willeica]

From my optical scientist friend:

" I think the viewer (actually both of them) was for photogrammetric use, as remarked by one contributor, and has similarities to the Wheatstone geometry in that the left and right photos have to be adjusted in position to get good overlap.    

I’m not sure what feature distinguishes the Wheatstone and Brewster stereoscopes, apart from the fact that the Brewster one has none-adjustable separations of the L&R photos (enabling compactness and ease of use), whereas the Wheatstone one has flexibility … and needs at least one pair of mirrors to achieve this.   

In brief, I think you’re correct! "

For photogrammetric use, see here:

https://en.wikipedia.org/wiki/Unmanned_aerial_photogrammetric_survey

I had shown Howard Grubb's full 1879 piece to my friend before. The full address (to the Royal Dublin Society) goes on to compare the Wheatstone and Brewster models with the advantages and disadvantages of each and to suggest further improvements. However, I am not aware that the Grubb company produced that design, but there are several examples of 19th Century wooden stereo cameras equipped with a pair of matched Grubb brass lenses.

William 

Edited July 26, 2024 by willeica