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Forensic Lens upto Film > Chapter 6 FILM > Flashcards

Chapter 6 FILM Flashcards

1
Q

It is only a fraction of an inch thick, yet it is made of many layers. It is a “Sensitized Material”

A

Film

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2
Q

This refers to a cellulose tape or plate where silver salts are suspended that are capable of recording light.

A

Film

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3
Q

Structure of Black – and – white film

A
  1. Top Coating/Varnish Coating/Protective Coating
  2. Emulsion Layer/Inert Gelati
  3. Film Base/Backing/Base
  4. Anti – halation Backing/Anti – Curl
  5. Structure of Color Film
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4
Q

This refers to emulsion layer that consist of three (or four) layers stacked one on top of another with filter
in between each.

A
  1. Structure of Color Film
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5
Q

This refers to a black dye applied on the rear surface of the film, it absorbs light that may penetrate the emulsion layer to prevent it from reflecting back to the emulsion thus making the mage sharper since it suppresses double image, and prevents the appearance of halo formation in the photograph.

A
  1. Anti – halation Backing/Anti – Curl
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6
Q

This refers to structure of film that is made of cellulose acetate or other materials such as paper, plastic, or glass which supports the emulsion layer and is coated with a non – curl anti – halation backing.

A

Film Base/Backing/Base

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7
Q

This refers to structure of film that composed of silver halides and gelatine – a layer composed of silver
compounds (which are light sensitive) and halogens (such as bromide, chloride, and iodide which is used in small
amounts, seldom made more than 5% with silver bromide in fast film emulsion).

A

Emulsion Layer/Inert Gelatin

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8
Q

This refers to top layer; scratch – resistant coating; gelatine coating; an over – coating composed of a thin transparent layer of hard gelatine which helps protect the silver halide emulsion from scratches and abrasions.

A

Top Coating/Varnish Coating/Protective Coating

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9
Q

This refers to a sensitive to blue light only; green and red light passes through it without exposing the color
halides.

A

Blue Filter

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10
Q

This refers to Carey – lea silver suspended in gelatin – it is coated between the top and second layer to absorb any penetrating blue light but allowing green and red light to pass through

A

Yellow Filter

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11
Q

This refers to a layer that is orthochromatic; the layer sensitive to blue light (which cannot reach it) and green, but not to red; red light passes on the bottom of the emulsion layer.

A

Green Filter

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12
Q

This refers to a panchromatic layer, sensitive to blue and red.

A

Red Filter

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13
Q

Typology of Films
a. According to Use

A

Black and White Film
Color Film
Chrome Film
X – ray Film

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14
Q

This refers to a material which is sensitive to X – ray region of the electromagnetic spectrum.

A

X – ray Film

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15
Q

This refers to films with names ending in Chrome – for color transparency – for slides films that are exposed by slides, mounted in a cardboard for slide projectors; reversal type.

A

Chrome Film

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16
Q

This refers to films that have name ending in Color – color negatives for prints

A

Color film

17
Q

This refers to film intended for B and W photography

A

Black and white film

18
Q

According to Spectral Sensitivity (Color Sensitivity) are?

A

Monochromatic Film
Panchromatic Film
Orthochromatic Film
Infrared Film
Non – Chromatic

19
Q

this refers to film that is sensitive to ultraviolet and blue – violet colors only, and may be used when natural
radiation is not important.

A

Non – Chromatic

20
Q

This refers to film that is sensitive to infra – red and ultra – Violet radiation, which is beyond the human
eye’s sensitivity, also sensitive to all the colors found in the spectrum, and useful in penetrating haze because
of its longer wavelength.

A

Infrared Film

21
Q

Also known as kodalit film

This refers to film that is sensitive to UV rays, blue and green colors but not to red

A

Orthochromatic film

22
Q

This refers to film that is sensitive to a single color of light

A

Monochromatic Film

23
Q

This refers to film that is sensitive to ultra – violet rays, and all light found in the visible spectrum, especially
to blue and violet light, suitable for general use in the preparation of black – and – white photographs and most
commonly used in investigative photography because it produces the most natural recording of colors.

A

Panchromatic Film

24
Q

This refers to film that is sensitive to UV rays onlyUltra

A

Ultra – Violet Sensitive Film

25
Q

This refers to film that is more sensitive to blue rays of light

A

Blue Sensitive Film

26
Q

Two Main Types of Color Film

A

Color Reversal of Color Film
Color Negative Film

27
Q

This refers to film that produces transparencies that can be mounted as slides and projected with a slide
viewer or on a light box, and end in the word Chrome.

A

Color Reversal of Color Film

28
Q

This refers to film that is used in making prints, end in the word Color

A

Color Negative Film

29
Q

This refers to film sensitivity to light. This higher the rating of the film, the more sensitive it will be.

A

Film Speed

30
Q

Film Speed Rating – Types of speed ratings

A
  1. ASA (Americal Standards Association)
  2. DIN (Deutche Industries Normen) (German Institute for standardization)
  3. ISO (Combination of ASA and DIN) (International organization for standardization)
31
Q

Meaning of the following:
ASA
DIN
ISO

A
  1. ASA (Americal Standards Association)
  2. DIN (Deutche Industries Normen) (German Institute for standardization)
  3. ISO (Combination of ASA and DIN) (International organization for standardization)
32
Q

Classification of Films According to Sensitivity

A
  1. Slow
    ASA 100 below – the finer the grain structure, the richer the color saturation and more impressive the
    image sharpness. For color works ASA 25, 50 and 64 films are ideal in glamour photography but all require a
    high level of light.
  2. Medium – ASA 100 and 200.
  3. Fast
    Above ASA 200 to 1600 – need less light. Feature coarser grain, weaker color and a slight reduction in
    image sharpness
  4. Ultra – fast – ASA 3200 and 6400.
33
Q

Slow, medium speed fill will handle 90% of the picture needed in police
photography.

A

Special Film for Special Purposes:

34
Q

Special Film for Special Purposes

A

Contrast Process Panchromatic Film
Contrast Process Orthochromatic Film
Infra – red Film
Very High Speed Film

35
Q

This refers to film that is sensitized with color dyes to make it possible to record only invisible infra – red heat waves, also sensitive to blue light, so special filters have to be put over the lens.

A

Infra – red Film

36
Q

This refers to film that is particularly valuable for law enforcement purposes. It is labelled only with #2475.
It is useful for taking pictures at night. It has an ASA 800 to 2000.

A

Very High Speed Film

37
Q

This refers to film that is similar to panchromatic, but it is much slower and more sensitive to blue than red
light.

A

Contrast Process Orthochromatic Film

38
Q

This refers to a fine grain film that gives sharp differences between black and white. It is used in copying documents and photographing fingerprints

A

Contrast Process Panchromatic Film

39
Q

Film Sizes

A

110 – This refers to film sizes for cartridge loading pocket cameras.
2. 120
This refers to film sizes that give a picture that measure about 2/14 inches wide.
2. 126
This refers to film sizes that is older and larger cartridge loading type,
4. 135
This refers to film sizes that are commonly known as 35mm, so named because the film is 35mm wide. It
was originally for motion pictures and the size used in commercial theatres.
5. 220
This refers to film sizes that are the same as 120’s but yields twice many exposures.

Forensic Lens upto Film (7 decks)

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