Good Low-light Vintage lens

Hi guys,
I'm looking to buy a good low-light lens to add to my kit. I currently have a 14-140mm which is awesome for outdoors however I'm finding its lacking indoors.

I looked through this list

and found this lens which looked like a good potential buy

EDIT: with this adapter

Also found the Jupiter-8 50mm to be very nice as seen here

Any other suggestions? Im looking for under $100
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