GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Finder (?), n.
   1. One who, or that which, finds; specifically (Astron.), a small telescope of low power and large field of view, attached to a larger telescope, for the purpose of finding an object more readily, called also a finder telescope or finder scope.
   
   [1913 Webster +PJC]
   
   
   2. (Micros.) A slide ruled in squares, so as to assist in locating particular points in the field of vision.
   
   [Webster 1913 Suppl.]