film and sensitometry the science of measuring an emulsions reaction (sensitivity) to light is...
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Film and SensitometryFilm and Sensitometry
The science of measuring an emulsion’s reaction (sensitivity) to light is called sensitometry
The Characteristic CurveThe graph that shows a film’s response to light, showing the contrast (gamma), latitude, and speed.
The science of measuring an emulsion’s reaction (sensitivity) to light is called sensitometry
The Characteristic CurveThe graph that shows a film’s response to light, showing the contrast (gamma), latitude, and speed.
Exposure LatitudeExposure Latitude
Exposure Latitude is the amount of
over - or under - exposure the film stock can tolerate.
The effect of latitude on the image
Exposure Latitude is the amount of
over - or under - exposure the film stock can tolerate.
The effect of latitude on the image
The Characteristic Curve and Film Speed
The Characteristic Curve and Film Speed
The overall degree of sensitivity of a film is expressed by the position of the characteristic curve in relation to the horizontal scale. It is rated by an exposure Index (EI). This value was also called an ASA or ISO
Faster films are more sensitive and have higher EI numbers.25 EI 50 EI 100 E 200EI 400EI
f/4 f/5.6 f/8 f/11 f/16(notice how f-stops relate to EI values.)
The overall degree of sensitivity of a film is expressed by the position of the characteristic curve in relation to the horizontal scale. It is rated by an exposure Index (EI). This value was also called an ASA or ISO
Faster films are more sensitive and have higher EI numbers.25 EI 50 EI 100 E 200EI 400EI
f/4 f/5.6 f/8 f/11 f/16(notice how f-stops relate to EI values.)
Vision 3 500T.
ExposureExposure
Exposure is determined by intensity of light that pass through the lens and the time each frame is exposed to the light.
Exposure = Intensity X TimeIt is controlled by T-stop and Frame-rate
Other factures that play a role in determining exposure are:
Film speed, Lighting, Filter, Shutter Angle
Exposure is determined by intensity of light that pass through the lens and the time each frame is exposed to the light.
Exposure = Intensity X TimeIt is controlled by T-stop and Frame-rate
Other factures that play a role in determining exposure are:
Film speed, Lighting, Filter, Shutter Angle
The Film “Look”The Film “Look”
Grain Sharpness Depth of Field Exposure Latitude Color
Grain Sharpness Depth of Field Exposure Latitude Color
FiltersFilters
Color correction filters Neutral density filters Effects filters
Color correction filters Neutral density filters Effects filters
Color Correction FiltersColor Correction Filters
Color correction filters are used when shooting tungsten-balanced film of doors or when using daylight balanced color film indoors.
85 filters: when shooting tungsten-balanced color film out of doors.
85(the most commonly used), 85B, 85C 80 filters: When using daylight-balanced color
film indoors.
Color correction filters are used when shooting tungsten-balanced film of doors or when using daylight balanced color film indoors.
85 filters: when shooting tungsten-balanced color film out of doors.
85(the most commonly used), 85B, 85C 80 filters: When using daylight-balanced color
film indoors.
Neutral Density FiltersNeutral Density Filters
To cut down overall brightness and reduce all colors equally.
When to use ND filters Most common used: ND 0.3,ND 0.6 and
ND 0.9, need to increasing exposure (stops) in 1, 2 and 3 stops
To cut down overall brightness and reduce all colors equally.
When to use ND filters Most common used: ND 0.3,ND 0.6 and
ND 0.9, need to increasing exposure (stops) in 1, 2 and 3 stops
Effects Filters Effects Filters Diffusion filters, Nets, Ultraviolet (UV) filters: The filter most often used for
cutting haze and slightly warming the scene is the Sky 1-A. If you don’t want to extra warmth of Skylight filter, Haze 1 and 2A can be used
Fog filter Low contrast filters: produce less halation and less softening
than fog filter. (Tiffen Ultra Contrast filter) Polarizing filter: light striking an object radiates in all
directions Soft contrast filters Graduated filters
Diffusion filters, Nets, Ultraviolet (UV) filters: The filter most often used for
cutting haze and slightly warming the scene is the Sky 1-A. If you don’t want to extra warmth of Skylight filter, Haze 1 and 2A can be used
Fog filter Low contrast filters: produce less halation and less softening
than fog filter. (Tiffen Ultra Contrast filter) Polarizing filter: light striking an object radiates in all
directions Soft contrast filters Graduated filters
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