Video Cameras The Basics Flashcards
Zoom Ratio
Focal length range of variable focal length lens
Telephoto
Lens that has a narrow angle of acceptance
Wide-angle
Lens that has a great angle of acceptance
Prime
A high quality, fixed focal length lens used in HDTV and film is called a ___ lens
Focal length
Distance between optical center of lens and target
Zoom
Variable focal length lens is called a __ lends
A telephoto lens used at a great distance
In the “case of the wandering billboards” the photographer who wanted to make the signs look close together chose
Exaggerate distances and increase apparent speed
A short focal length lens tends to
Compress distances and reduce apparent along the lens axis
A long focal length lens tends to
Camera-to-subject distance
Spatial relationship differences that seem to accompany wide-angle and telephoto lenses are technically not a function of lens focal length, but
A wide-angle lens and positioned himself close to the first sign
In the “case of the wandering billboards” the photographer who wanted to make the signs look far apart used
Rack focus
change focus to shift viewer attention from one part of the scene to another
Reduces the amount of light going through lens: moving an iris setting from f:8 to f:16
Macro setting
enables the lens to attain sharp focus on an object only a few inches or even a few millimeters from the front of the lens
Depth of field
the area along the lens axis that’s acceptably sharp is referred to as
Selective focus
term for the process of using limited depth of field to intentionally throw areas of the picture out of focus
Increases the amount of light moving through lens
moving an iris setting from f:11 to f:8
Lens speed
the maximum amount of light that the lens can transmit is referred to as
F stops
the numerical points on a lens relating to the amount of light the lens transmits are called
Reduces the amount of light going through lens
moving an iris setting from f:8 to f:16
Neutral density (ND) filter
Filter used to control the amount of light passing through a lens
Ultraviolet filter
Used primarily to protect the camera lens from adverse conditions encountered in ENG (electronic newsgathering) work
Gel
A type of filter that’s much cheaper than a glass filter is the
Lens hood
Used to protect a camera image from offending glare or loss of contrast
Polarizing filter
Filter that reduces glare and reflections, deepens blue skies, penetrates haze, and intensifies colors
Periscope lens
Makes a “bug’s eye view “ of subject matter possible
Diffusion filter
Creates a dreamy, soft focus effect
Matte box
A small bellows device mounted on the front of the camera
1/2 Black Diffusion FX
Filter that is often used to make video look more like film
Star filter
Filter that creates “fingers of light” projected out from the sides of shiny objects
Optical image stabilizer
originally based on a gyroscopically controlled mechanism that resists short, fast movements by shifting lens elements in the opposite direction
Shot box
electronic lens controls that can memorize a series of zoom lens positions, complete with zoom speeds and focus settings
C-mount
finely threaded cylinder about 25 mm in diameter that attaches lens to some types of cameras
Digital image stabilization
electronically “floats” an active picture frame within a slightly larger target area
Rain jacket
protects camera from inclement weather conditions
