exposure

EXPOSURE

EXPOSURE

DEVC 151: EXPOSURE

- Process by which light is gathered by the camera lens to record a latent image onto the film

Considerations:

DEVC 151: EXPOSURE

1) Lighting conditiona) Bright Sun (BS) – subject casts distinct shadow

Considerations:

DEVC 151: EXPOSURE

1) Lighting conditionb) Hazy Sun (HS) – subject casts soft shadow

Considerations:

DEVC 151: EXPOSURE

1) Lighting conditionc) Cloudy Bright (CB) – subject has/ lesser shadow

Considerations:

DEVC 151: EXPOSURE

1) Lighting conditiond) Heavy Overcast (HO) – has no shadow, about to rain (or raining)

Considerations:

DEVC 151: EXPOSURE

1) Lighting conditione) Open Shade (OS) – subject under any lighting condition but under a shade

Considerations:

DEVC 151: EXPOSURE

2) Shutter Speed and Aperture Combination

Bracketing – shooting same subjects with different f-stops and shutter speeds

Considerations:

DEVC 151: EXPOSURE

3) Focus

Considerations:

DEVC 151: EXPOSURE

4) Type of FilmFilm – a roll or sheet of thin, flexible, transparent material cover on one side with light –sensitive silver salts.

Considerations:

DEVC 151: EXPOSURE

4) Type of FilmTYPES OF FILM:

1) Based on Film Speed – degree of light sensitivity of the film

- ranges from 25 – 3200 ASA

Considerations:

DEVC 151: EXPOSURE

4) Type of FilmTYPES OF FILM:

- Higher ASA, the amount of light needed to produce a normal image decreases

- The higher the film speed, the more sensitive the film to light

Considerations:

DEVC 151: EXPOSURE

4) Type of FilmTYPES OF FILM:

1) ASA – N. America, Australia, Asia2) Deutche Industrie Norme (DIN) – Continental Europe3) International Standards Organization (ISO) – two film speed figures (ASA/DIN)4) GOST - Russia

Considerations:

DEVC 151: EXPOSURE

4) Type of FilmTYPES OF FILM:

a) Slow-speed film (ASA 25-ASA 50) – excellent for brightly-lighted scenes

- Has a rich gradation of tones and virtually no grain

Considerations:

DEVC 151: EXPOSURE

4) Type of FilmTYPES OF FILM:

b) Medium-speed film (ASA 100 – ASA 200) – general-purpose film suitable to most subjects and lighting conditions- Versatile

Considerations:

DEVC 151: EXPOSURE

4) Type of FilmTYPES OF FILM:

c) Fast Film (ASA 400 – ASA 500) – best for taking pictures in low light situations like campfire settings or candlelit scenes or when fast action demands high shutter speeds

Considerations:

DEVC 151: EXPOSURE

4) Type of FilmTYPES OF FILM:

d) Super Fast Film (ASA 1000 – ASA 3000) – can be used to take pictures in extremely dim light – as little as that given by a single candle

Considerations:

DEVC 151: EXPOSURE

4) Type of FilmTYPES OF FILM:

SLOW FAST

Crystal Size Small Large

Developing time needed

Shorter Longer

Sensitivity in Light Low High

Light Needed More Less

Numerical rate Low number High number

KINDS of EXPOSURE

DEVC 151: EXPOSURE

• Underexposed – low light

• Underexposed – low light

Dark (photo)Brighter (negative)

Brighter (photo)Dark (negative)

KINDS of EXPOSURE

DEVC 151: EXPOSURE

EXPOSURE NEGATIVE PRINT

NORMAL Black and Gray Gray and White

UNDEREXPOSED Light and Thin Very black

OVEREXPOSED Dark, dense Very bright and heavy

Determining Proper Exposure

DEVC 151: EXPOSURE

Using the Daylight Exposure Guide

- A manual exposure guide for outdoor picture taking for particular film and its film speed as provided by its manufacturer

Determining Proper Exposure

DEVC 151: EXPOSURE

Using the Daylight Exposure GuideISO 100-125

1/125

BS 1/125 F 16

HS 1/250 F 11

CB 1/500 F 8

HO 1/1000 F 5.6

OS 1/2000 F 5.6

Determining Proper Exposure

DEVC 151: EXPOSURE

Using the Daylight Exposure Guide

The Principle is:• Bigger aperture, faster shutter speed• Smaller aperture, slower shutter speed

Determining Proper Exposure

DEVC 151: EXPOSURE

Using the Daylight Exposure Guide

* As the light gets DIMMER, the aperture should be BIGGER to admit MORE light.

Determining Proper Exposure

DEVC 151: EXPOSURE