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Any ideas on what this might have been for?

Alaskan

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Alaskan

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Being I don't have the original fiber or know the wavelength it was used it, it could have been just that except it has a focal point of 150 meters marked on it. Maybe it was operated in reverse as a coupling into fiber for some kind of IR link. Was hoping someone might recognize it.
 
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Cyparagon

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Any ideas on what this might have been for?
You read the title of the auction, right? I don't really understand your question. A collimator is just a convex lens (NOT concave)
 




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