viewfinder
/ˈvjuːˌfaɪndər/
noun
- A device on a camera or other optical instrument that shows the user what will appear in the picture or image.
- She looked through the viewfinder to frame the perfect shot of the sunset.
- He adjusted the focus ring while peering into the viewfinder.
- The camera's viewfinder was foggy, so he wiped it clean with his shirt.