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Old 03-18-2015, 02:50 AM #1
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Default Any ideas on what this might have been for?

Anyone have a clue what this was for? It has marked on the side 150 meter focus and has fiber input. It doesn't work like a beam expander but does have an input lens inside which looks like a concave lens.



Large Beam Fiber Optic Collimator 80mm Daimeter x 160mm Length CTW Telescope | eBay


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Old 03-18-2015, 05:27 AM #2
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Default Re: Any ideas on what this might have been for?

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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Old 03-20-2015, 07:58 PM #3
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Default Re: Any ideas on what this might have been for?

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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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