What is this thing?

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mykl

Some sort of strange lens assembly I found at a Goodwill many years ago (lemmy.world)

submitted 1 week ago by turbowafflz to c/whatisthisthing

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1000016939

It has 4 lenses in total, two at each end. The only text on it is the number 50, stamped into the bottom of the ring that goes around the outside to attach it to whatever it goes with

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[–] Snailpope 25 points 1 week ago

https://www.etsy.com/listing/1722174900/antique-pocket-field-microscope

Looks like this antique pocket field microscope