film and filters
DESCRIPTION
Film and filters. The structure of the negative. Antihalation backing (dissolved away during development). Top Coat (dissolved away during development). Support. Emulsion. Subbing. Light waves. Infrared film was popular in the ‘70s, but is not commonly used anymore. . - PowerPoint PPT PresentationTRANSCRIPT
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.
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!
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
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
Polarizing Filters
http://www.ehow.com/video_4756343_what-polarized-light.html
http://www.ehow.com/video_5238817_use-circular-polarizer.html