CINEMATOGRAPHY: SIZE OF IMAGE
Film Gauge: The width of the film stock measured in millimetres. 35 mm stock is the standard for commercial feature films though 16 mm is becoming more prominent. 70 mm stock is used for many “major” productions. The larger the gauge the bigger the screen size and better the clarity of definition.
Aspect Ratio:The ratio of the width to the height of the film. The formerly standard Academy Aperture, established by the Academy of Motion Pictures Arts and Sciences in 1932 for 35 mm is 1.33:1 or 4:3. Widescreen usually refers to aspect ratios of 1.66:1 or greater and most 35 mm film is now masked for projection at an aspect ratio of 1.85:l. Cinemascope (aspect ratio 2.35:1) refers to the widescreen process invented by Henri Chrétien and first used commercially by Twentieth Century Fox in the 1950s. Its basis was an anamorphic lens which enabled the wide-screen image to be squeezed into a conventional 35 mm frame, with a compensating lens on the projector to expand it again. Panavision is now the most frequently used widescreen process where the image is photographed on 70 mm negative
and either printed normally for projection on 70 mm or squeezed anamorphically on to 35 mm positives, or in the case of Ultra-Panavision on to 70 mm (aspect ratio 2.7:1).
CINEMATOGRAPHY: NUMBER OF IMAGES
Split screen: When two or more separate images are in the same frame, not overlapping.
Double exposure: When a number of images are printed over each other.
CINEMATOGRAPHY: DEFINITION OF IMAGE
Texture: As used in regard to film stock, definition indicates the power of the film to define the elements of an image i.e. the measure of the grain (where grain is a quality of the emulsion of a film, emulsion being the thin coating of chemicals, mounted on the base of the film stock that reacts to light). The visibility of the grain varies inversely with the size of the film gauge and directly with the amount of overdevelopment (as used to compensate for under-exposure).
Focus: Through the adjustment of the lens, a shot can be in focus,giving a sharply defined image, or out of focus causing the image to be blurred.
Soft focus refers to the soft and slightly hazy effect obtained by shooting slightly out of focus or through the use of filters placed in front of the lens, often synonymous with highly romantic images.
CINEMATOGRAPHY: DEPTH OF IMAGE
Depth refers to the range of distances from the camera at which the subject is acceptably sharp. Perception of depth is a product of choice of lens (the shorter the lens the greater the perception of depth), aperture opening (the narrower the aperture the greater the perception of depth), amount of lightand sensitivity of film stock(reduction of aperture opening requiring compensation in terms of additional light or increased sensitivity of film stock), camera position and angleand the use or absence of compositional and lighting contrastwithin the frame.
Normal lenses: Used in 35 mm photography these have a focal length of between roughly 35 mm and 50 mm, where focal length refers to the distance from the plane of the film to the surface of the lens.
Wide-anglelenses: Usually refer to lenses of focal length of less than 35 mm, which as well as increasing the angle of view increase perception of depth.
Telephoto lenses: Usually refer to lenses of focal length of more than 60 mm, which as well as magnifying distant objects decrease depth perception.
Deep focus: Refers to the technique in which objects very near to the camera as well as those far away are in focus at the same time.
Shallow focus: Refers to the technique that uses a shallow depth of field.
Follow Focus: To pull or change focus during a shot in order to follow a subject as it moves away from or towards the camera.
Rack Focus: To pull focus to shift the focus plane, directing attention from one subject to another.
CINEMATOGRAPHY: CAMERA POSITION
Angle: Angle at which the camera is pointed at subject.
Aerial shot: A shot taken from a crane, plane or helicopter.
Overhead shot: A shot taken from a high building or the like.
High angle shot: A shot taken from above looking down at subject.
Low angle shot: A shot taken from below looking up at subject.
The term camera angle is not to be confused with the term angle of view which refers to the angle subtended by the lens. Wide-angle lenses have broad angles of view, telephoto lens have narrow angles of view.
Distance: The amount of subject viewed (in relation to distance of camera from subject – though this is course confused by the use of zoom lenses).
Extreme close-up: Very close shot, say of subject’s eyes only.
Close-up: Shot of subject’s face only.
Head and shoulder shot: As described
Medium shot: Shot cut off at waist. 3
Three-quarters shot: Shot cut off at knees.
Full shot: Shot of whole body.
Long shot: Shot including more than whole figure.
Extreme long-shot: Panoramic view of an exterior location.
CINEMATOGRAPHY: CAMERA MOVEMENT
From Fixed axis:
Pan: Movement of camera from left to right or right to left.
Tilt: Movement of camera up or down.
Roll: Circular movement of camera around axis from lens to subject.
From Shifting axis:
Travelling/Tracking Movement of camera from one point to another,
Dolly shot: whether sideways, in or out or diagonally. Being precise, a dolly shot refers to a shot where the camera is mounted on a dolly (basically a platform on wheels) and tracking shot when the camera is moved using specially laid tracks. Likewise a crane shot refers to the movement of the camera mounted on a crane.
Zoom: The use of a zoom lens (one of variable focal length) can substitute for a travelling shot. Adjustment of lens focal length can bring the subject closer or further away from the camera without movement of the camera (though remember this has effects on depth perception).
CINEMATOGRAPHY: SPEED OF IMAGE:
Slow v fast v normal: Normal shooting and projection of sound film is 24 frames per second (for silent film it is 16-18 fps). For fast or accelerated motion, film is shot at less than 24 fps and projected at normal speed; for slow motion, film is shot at more than 24 fps and again projected at normal speed.