What is Viewfinder?

System used for composing and focusing on the subject being photographed. Aside from the more traditional rangefinder and reflex
viewfinders, many compact digital cameras utilize LCD screens in place of a conventional
viewfinder as a method of reducing the camera's size (and number of parts). In recent years, electronic
viewfinders (EVFs) have become increasingly better and are they slowly finding their way into traditional DSLRs.
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