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Rare custom optical assembly convex mirrors wedge prism 100mm

These glass columns or pillars have 15x little convex mirrors Ø5,5mm and at the edge we have a rectangular optical wedge which measures 10x8mm. Total column height is 100mm and it is 11mm thick. It has a side lettering with pencil which says "37-DD19-2".

Purpose: Unknown, probably physics research or educational.
Optical standard: unknown (most probably BK-7 substrate).
Class A-: Four units available. Overall very good condition. No mayor flaws found.

All USA shipping is now DDP: all import duties/tariffs included paid in advance so that you won't pay additional taxes (this only applies to "international economy shipping" sent to be received through Post Office, not UPS or FEDEX).