A video tap is an accessory for a
motion picture camera
A movie camera (also known as a film camera and cine-camera) is a type of photographic camera that rapidly takes a sequence of photographs, either on an image sensor or onto film stock, in order to produce a moving image to project onto a movie sc ...
used in
filmmaking
Filmmaking (film production) is the process by which a motion picture is produced. Filmmaking involves a number of complex and discrete stages, starting with an initial story, idea, or commission. It then continues through screenwriting, casti ...
to provide a video signal from the camera lens. Video taps are used to allow the
film crew
A film crew is a group of people, hired by a production company, for the purpose of producing a film or motion picture. The crew is distinguished from the cast, as the cast are understood to be the actors who appear in front of the camera o ...
to see what is in the camera's frame without having to look through the
viewfinder
In photography, a viewfinder is what the photographer looks through to compose, and, in many cases, to focus the picture. Most viewfinders are separate, and suffer parallax, while the single-lens reflex camera lets the viewfinder use the main ...
, as well as allowing video to be recorded and can be used to create an immediate
rough cut
In filmmaking, the rough cut is the second of three stages of offline editing. The term originates from the early days of filmmaking when film stock was physically cut and reassembled, but is still used to describe projects that are recorded and e ...
, if needed. Since a video tap normally attaches to a camera's existing viewfinder using a
beam splitter
A beam splitter or ''beamsplitter'' is an optical device that splits a beam of light into a transmitted and a reflected beam. It is a crucial part of many optical experimental and measurement systems, such as interferometers, also finding wide ...
, the video appears dark and
frame rate
Frame rate (expressed in or FPS) is the frequency (rate) at which consecutive images (frames) are captured or displayed. The term applies equally to film and video cameras, computer graphics, and motion capture systems. Frame rate may also be ca ...
flicker is visible. Sometimes the tap will include frame lines and burned in
timecode
A timecode (alternatively, time code) is a sequence of numeric codes generated at regular intervals by a timing synchronization system. Timecode is used in video production, show control and other applications which require temporal coordination ...
and
keykode.
Film and video technology
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