Noun
viewfinder (plural viewfinders)
A device on a camera that shows what will appear in the field of view of the lens; it helps the user target a subject, zoom and focus the image.
Because the viewfinder and the film lens cannot share the same optical path, the viewing lens is aimed to intersect with the film lens at a fixed point somewhere in front of the camera. Source: Internet
A right-angle finder is available that slips onto the eyepiece of most SLRs and D-SLRs and allows viewing through a waist-level viewfinder. Source: Internet
A few SLRs on the market offer a third viewfinder option—an electronic viewfinder. Source: Internet
Also, during heavy sunlight, you really want to be using the viewfinder instaed of the back screen since heavy sunlight blacks out the screen like on a smartphone. Source: Internet
As the viewfinder is often found above the lens of the camera, photos with parallax error are often slightly lower than intended, the classic example being the image of person with his or her head cropped off. Source: Internet
A viewfinder, battery, and handle are all add-ons that can add hundreds or thousands to the price. Source: Internet