From Longman Dictionary of Contemporary Englishviewfinderview‧find‧er /ˈvjuːˌfaɪndə $ -ər/ noun [countable] TCPthe small square of glass on a camera that you look through to see exactly what you are photographing
Examples from the Corpus
viewfinder• To save space and money, Canon omitted the standard optical viewfinder.• Next, switch from auto-focus to manual and practise setting the focus by hand while you watch the effect in the viewfinder.• Practise holding and using the camcorder keeping the picture in the viewfinder steady.• You have to create your picture in the viewfinder.• My tiredness had gone; all that mattered was what was in the viewfinder.• Jill looks straight into the viewfinder.• You may also have noticed that the viewfinder is displaying signal indications as well as the picture itself.• Harriet hardly dared blink as she watched her through the viewfinder, terrified she might miss the moment she was waiting for. 