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