
der Finder
finder
A person who discovers something by chance, especially something that has been lost.
Der ehrliche Finder gab die gefundene Brieftasche im Fundbüro ab.
The honest finder handed in the found wallet at the lost property office.
finder / viewfinder
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finder
A person who discovers something by chance, especially something that has been lost.
Der ehrliche Finder gab die gefundene Brieftasche im Fundbüro ab.
The honest finder handed in the found wallet at the lost property office.

viewfinder
The part of a camera that you look through to determine the image frame; another word for the viewfinder.
Bei digitalen Spiegelreflexkameras schaut man durch einen optischen Finder.
With digital SLR cameras, you look through an optical viewfinder.
The word 'Finder' (finder) is derived directly from the verb 'finden' (to find). The ending '-er' forms, as with many German verbs, the masculine person who performs the action.
Wer etwas findet, ist der Finder.
Whoever finds something is the finder.
The combination 'der ehrliche Finder' (the honest finder) is very common and describes a person who returns a found object. Legally, the finder often has a claim to a 'Finderlohn' (finder's reward).
Der ehrliche Finder brachte das Portemonnaie zur Polizei.
The honest finder took the wallet to the police.
The meaning 'Sucher' (viewfinder) is used exclusively in the context of cameras and photography. Words such as 'Kamera' (camera), 'Objektiv' (lens), or 'Bildausschnitt' (image frame) in the sentence make it clear that this technical part is meant.
Bei meiner alten Kamera muss ich durch den optischen Finder schauen, um das Motiv zu sehen.
With my old camera, I have to look through the optical viewfinder to see the subject.
discoverer
The Entdecker finds or recognizes something previously unknown and is often associated with new countries, facts, or species. The Finder, by contrast, usually discovers a specific thing by chance, especially something that has been lost. Use „Entdecker“ for a new discovery and „Finder“ for a lost object.

Der Finder des verlorenen Rucksacks brachte ihn zur Polizei.
The person who found the lost backpack took it to the police.
Der Entdecker einer neuen Pflanzenart stellte seine Ergebnisse auf einer Konferenz vor.
The discoverer of a new plant species presented the findings at a conference.