撿到、找到東西的人
核心角色落在人身上：東西出現的那一刻，手在那裡的那個人。
noun · B1
The person who finds something that was lost, dropped or stolen — the one who picks it up or spots it, whether or not it belongs to them.
拾獲者；發現的人
核心畫面
Think of the moment something hidden or lost comes into view, and someone or something is standing at that moment. Finder names whoever or whatever was there when the thing was found: the person whose hand closes on a dropped wallet, or the small part of a camera that brings the thing you are hunting for into the frame.
可以想成「東西出現的那一刻」，而在那一刻站在那裡的，就是 finder。它可能是人：手剛好碰到掉在地上的皮夾。也可能…更多收起
可以想成「東西出現的那一刻」，而在那一刻站在那裡的，就是 finder。它可能是人：手剛好碰到掉在地上的皮夾。也可能是零件：相機上那個小窗口，把你要找的東西框進畫面裡。這個字指的一直是「把東西找出來的那一個」，不是被找到的東西。From the word’s history
Wiktionary gives finder as Middle English findere, by surface analysis find + -er — the one who finds. Every use here is that same role, handed to a person or to a part of a machine.
Wiktionary 記 finder 來自中古英文 findere，拆開看就是 find 加 -er：找到的那一個。這裡的每個用法，都只是把這個角色交給人或交給零件。
Wiktionary entry for finder, etymology field: "From Middle English findere. By surface analysis, find + -er." (kaikki:3f6f69a190036ae4:1145445459:4474)
Two branches
幫你把目標找進畫面的小裝置
同樣的角色，從人搬到零件上：真正「把東西找出來」的動作交給了機器的一小部分。
noun · B2
The small window on a camera, or the small telescope fixed to a bigger one, that you look through to find the thing you want and point the camera or telescope at it.
觀景窗；尋星鏡