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ArcticMyst Security by Avery

What is this?

Joined
Aug 22, 2011
Messages
55
Points
0
It could be something non-optical.
I am pretty sure it is though...

...hence me post ;)

Any input would be grand.
(help is all I've asked for around here, sheesh)

Layman's description:
At first I thought it was a knob (stereo, fine-tuning, etc) But the would-be knob unscrews from housing with a rubber gasket at base of threads. The hollow "cap" unthreads to reveal the guts if you will. The tube leading to the insides is hollow, which has a clear triangle seated right in the hollow area. After that is another flat round optic fitted into an intricate aluminum bracket. The pictures say more than I can:
 

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Joined
Sep 12, 2007
Messages
9,399
Points
113
It looks like a tuning prism for an ion laser.

By turning the knob, you can select the lasing line.
 




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