FILM AND FILTERS

The structure of the negative

Antihalation backing (dissolved away during development) Support

Subbing

Emulsion

Top Coat (dissolved away during development)

Light waves

Infrared film was popular in the ‘70s, but is not commonly used anymore.

The film we use, Kodak Tri-X, is sensitive to visible and UV light.

Color Sensitivity: Blue-sensitive film

Blue + UV

Color Sensitivity: Orthochromatic

All colors but red

Color Sensitivity: Panchromatic

All colors

Film Speed (ISO)rating sensitivity contrast grain

50 ISO/ASA low low low

100 ISO/ASA medium medium medium

200 ISO/ASA medium medium medium

400 ISO/ASA high high high

800 ISO/ASA very high very high very high

lower numbers = slower films = need more light = longer exposureshigher numbers = faster films = need less light = shorter exposures

http://www.photonhead.com/beginners/filmspeed.php

Film Latitude “The amount of deviation from the

correct exposure that will still produce decent pictures.” -Photography in Focus

Generally, you have better latitude with over exposure than underexposure

Resolving Power The ability of the film to record fine

detail.

Incorrect exposure can alter resolving power. All the more reason to have correctly exposed film!

Filters

What kinds of filters can we use for black and white film?

Types of filters Correction: changes the tonal response of

the film so that all colors are photographed at about the same as the eye originally saw

Contrast: either increases or decreases the contrast between colors

Haze: reduces atmospheric haze caused by dust and water vapor

Polarizing: stops the path of polarized light; useful for water, glass, or other reflective surfaces

Correction Filters

No. 8 Yellow Filter

Contrast Filters Include color filters that manipulate the

contrast between certain colors (translates into gray tonal ranges in black and white)

http://www.ehow.com/video_5116416_effect-filters-black-white-photography.html

Haze Filters

Use haze filters for distant landscapes or high altitudes

Polarizing Filters

http://www.ehow.com/video_4756343_what-polarized-light.html

http://www.ehow.com/video_5238817_use-circular-polarizer.html

Polarizing and Red Filters