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One of my faves
https://www.gemologyonline.com/Forum/phpBB2/viewtopic.php?f=58&t=10418
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Author:  G4Lab [ Thu Jan 07, 2010 11:27 pm ]
Post subject:  One of my faves

Here is one of my most favorite things. A surgeons binocular loupe. This one comes in a pair of eyeglass frames (very stylish :lol: ) which you can have your prescription lenses installed in if any.

I managed to talk an employer of mine into buying me a pair in 1977 and could not imagine being without them.

These are the real deal from chermany. They were imported to the US by the Miltex (surgical instrument importers)company but were actually made by a company called Oculus, probably long gone. I don't know why they are calling them biopsy glasses I have never heard that term before and I used to sell similar items. German ones sell for three or four hundred dollars and up.

After a rather long wait , far east inc. is making them now too. They were also copied earlier by the Russians or maybe it was the Byelorussians I forget which. :wink:


Sold for $59.57 delivered. A bargain for sure.

Author:  cascaillou [ Fri Jan 08, 2010 3:41 pm ]
Post subject: 

Quote:
Here is one of my most favorite things. A surgeons binocular loupe


freaky :lol:

Author:  G4Lab [ Fri Jan 08, 2010 5:59 pm ]
Post subject: 

Quote:
freaky Laughing


Check out the movie Twelve Monkeys :lol: :lol: :twisted:

Author:  Peter Torraca [ Sat Jan 09, 2010 8:47 am ]
Post subject: 

Sheesh, I wish I had seen that sooner. I'm using the Eschenbach glasses (e.g., http://www.ottofrei.com/store/product.p ... t=0&page=2 ) I love the things -- light, clear and *a lot* more comfy than the old-school Opti-visor. But I suspect surgeons glasses have far better optics (glass, for starters).

Any idea what the magnification and focal length is on those? It seems they have individual adjustments at the top.

peter

Author:  G4Lab [ Sat Jan 09, 2010 9:01 am ]
Post subject: 

Hi Peter,
The magnification of that loupe is probably less than your Eschenbach loupe.
Optivisor has made a version similar to the Eschenbach for a lot less money.
http://www.doneganoptical.com/clipon.php

The surgical loupe is a pair of Galilean telescopes. This restricts the magnification to just under three X at which point they switch to roof prism or other type of Keplerian optical system. Its like the difference between field or opera glasses of the original use of the word and binoculars. One has an image inverting and erecting system but the simpler one doesn't

The adjustments above are to center the optics right in front of your eye
The field of view is usually about 10 to 14 inches and depends on your eye too.

The advantage of these is wider field of view than single lens types. I have an version of your Eschenbach made by American Optical in the forties. My uncle gave it to me. He was one of the original watch and clock hobbyists.

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