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Forensic Photography > Exposure > Flashcards

Exposure Flashcards

1
Q

four variables of a good exposure

A

F.L.A.S. (H)
Shutter speed (1/sec)​
Apertures (f/stops)​
Film speed / digital ISO equivalents​
Light (ambient or supplemental lighting)

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2
Q

proper exposure triangle

A

sides of the triangle
-f/stop (aperture)
-film speed (ISO)
-shutter speed
center of triangle
-light (ambient/flash)

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3
Q

Exposure

A

The product of the intensity of _light that reaches the film plane/digital sensor which is controlled by the lens aperture (diaphragm)_and the length of time which is controlled by the shutter speed

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4
Q

types of exposure

A

Properly exposed, underexposed, or overexposed

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5
Q

exposure that halves ligjht

A

-1

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6
Q

exposure that doubles light

A

+1

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7
Q

properly exposed

A

0

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8
Q

single lens reflex

A
  1. First the image viewed by the photographer through the viewfinder and the light striking the sensor both come from a single lens
  2. Second the light coming from the lens is reflected (reflex) by a series of mirrors to the viewfinder
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9
Q

type of camera that is not a SLR

A

point and shoot

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10
Q

identify components of camera

A

1.Lens elements (a series of prisms that allows rays of light to come to a point of convergence)​

2.Mirror down​

3.Shutter’​

4.Sensor​

5.Mirror up​

6.Condenser lens​

7.Pentaprism​

8.Viewfinder

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11
Q

shutter typically can be found in ?

A

camera body

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12
Q

what is shutter speed?

A

amount of time the shutter is allowed to stay open

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13
Q

Shutter speeds may be indicated as whole numbers, but are really fractions. what are the shutter speeds?

A

1
2
4
8
15
30
60
125
250
500
1000
2000

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14
Q

Whole number by itself =
Whole number with “” = ​
1/60 is faster than ?

A

fraction ex: 15, 1/15
whole number ex: “15”, 15​
1/15

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15
Q

what happens if you need longer shutter speeds?

A

B = bulb ​

Shutter remains_open____ until shutter button is _released______​

Remote shutter release cable can be used instead of depressing shutter button

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16
Q

slower shutter speed (open for longer)

A

more light

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17
Q

fast shutter speed (open not as long)

A

less light

18
Q

faster shutter speed (open shorter)

A

even less light

19
Q

shutter speeds slower than 1/60 require a tripod why?

A

Because a little bit of your natural hand shake is going to cause blur in image

20
Q

what is aperture (f-stops)?

A

The opening in the lens (diaphragm) through which light passes

21
Q

what is the diaphragm

A

set of blades forming a circular opening

22
Q

the size of the aperture is either ? or ?

A

fixed or adjustable

23
Q

lens opening are usually calibrated in ?

A

f/stops (fractions)

24
Q

primary f/stops

A

f1
f1.4
f2
f2.8
f4
f5.6
f8
f11
f16
f22
f32
f45

25
Q

shutter speed going towards 1

A

slow
more light
creative blur
eliminates

26
Q

shutter speed going towards 2000

A

fast
less light
freezes motion

27
Q

apertures going towards 1

A

open
more light
less DOF

28
Q

aperture going towards 45

A

closed
less light
more DOF

29
Q

ISO going towards 100? towards 800?

A

-less sensitive
-more sensitive

30
Q

f/stop fractions

A

relates size of aperture opening (DOD) to the focal length of the lens (FLL)

31
Q

The larger the number the smaller the opening

A

Less light
narrow diaphragm

32
Q

The smaller the number the larger the opening

A

more light
large diaphragm

33
Q

4 non-normal scenes

A

dark-colored scenes

light-colored scenes

dark and light scenes
​
scenes with a lot of sky

34
Q

what will light meters provide for normal scenes?

A

Light Meters will provide proper exposures for ‘Normal ‘ Scenes  reflects 18%

35
Q

reflective light meter

A

built-in near sensor to determine the amount of the light to properly expose the image

36
Q

averaging/center-weighted meters

A

emphasizes light from the center of view, most of light coming in through lens

37
Q

spot meter

A

measures light from a small area of the center - specific area to be properly exposed

38
Q

matrix meter

A

break up light coming in into series of grids

39
Q

reflects 18% of the light that strikes the scene

A

normal scene

40
Q

18% gray card

A

standard used to determine the correct amount of light to enter the camera

41
Q

what else reflects about 18%?

A

grain grass and well-traveled asphalt

42
Q
A

Forensic Photography (7 decks)

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