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Forensic Lens upto Film > Chapter 4 Lens > Flashcards

Chapter 4 Lens Flashcards

1
Q

A disc of transparent glass generally bounded by two spherical surfaces capable of transforming an image.

A

Lens

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2
Q

A piece of transparent material made of glass or plastic with 2 opposite symmetrical surfaces or at least one curved
surface

A

Lens

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3
Q

The eye of the camera is also the heart of the camera.

A

Lens

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4
Q

The eye of the camera is also the heart of the camera.

A

Lens

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5
Q

B. Typology of Lenses (Pallista, 2019)

General Classification

A

Simple Lenses
Compound Lenses

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6
Q

composed of 1 lens

A

Simple Lenses

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7
Q

Simple lenses generally produce aberrated (imperfect) images which can be corrected using compound lenses .

A

Compound Lenses

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8
Q

It consists of two or more simple lenses fitted together

A

Compound Lenses

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9
Q

A lens that is thicker at the middle than at the edge.

It gathers light rays and refracts them to meet in a certain point

A

Convex Lens (converging lens/ positive lens)

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10
Q

It is thicker at the edges than at the center; light rays passing through a diverging lens are vent outward

A

Concave Lens (diverging/negative lens)

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11
Q

is the largest opening of the diaphragm that the light can pass through.

A

Lens Speed

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12
Q

is important in taking pictures in dim light

A

Lens Speed

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13
Q

Types of lenses based on Lens Speed

A

Fast Lens
Slow Lens

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14
Q

A lens with larger maximum aperture (that is, a smaller f-number) is a fast lens because it delivers more light
intensity to the focal plane, allowing a faster shutter speed.

A

Fast Lens

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15
Q

A smaller maximum aperture (larger maximum f – number) is slow lens because it delivers less light intensity and
requires a slower shutter speed.

A

Slow Lens

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16
Q

This refers to the size of the image produced by lens depend upon factors – camera – to – subject and focal
length

A

Image Size

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17
Q

This refers to good lenses that are capable of reproducing circles of confusion much smaller than 1/1000
of an inch

A

Depth of Focus

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18
Q

This refers to the lens that is focused on an object at infinity, the distance from the lens to the nearest object in sharp focus is called

A

Hyperfocal Distance

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19
Q

This refers to the distance from the optical center of the lens to the focal plane, when the lens is focused on infinity.

A

Focal Plane

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20
Q

This refers to the distance so far away that rays are considered parallel when they reach the camera.

A

Infinity

21
Q

This refers to the point of convergence of the light rays

A

Real Focus

22
Q

This refers to the point where diverging rays would meet if their directions were reversed.

A

Virtual Focus

23
Q

Groups of Lenses According to Focal Length and Characteristics are?

A

Lens is characterized by its focal length
Short – focal – lens or Wide Angle Lens
Fish Eye Lens
Long or Telephoto Lens or Narrow Angle
Zoom Lens
Macro Lens
Shift of Perspective Control Lens

24
Q

The distance between the lens (technically from its rear nodal point) and the focal plane when the lens is focused on
infinity.

A

Focal Length

25
Q

Focal length controls the following:

A

Magnification
Angle of view
Standard or Normal Lens

26
Q

A lens with a focal length equal to the diagonal measure of the image area

A

Standard or Normal Lens

27
Q

The amount of the scene shown on a given size of film

A

Angle of view

28
Q

The size of the image formed by the lens

A

Magnification

29
Q

It has a shorter focal length than the normal lens.

A

Short – focal – lens or Wide Angle Lens

30
Q

A lens with extreme wide angle.

A

Fish Eye Lens

31
Q

Lens with longer focal length that constrict the field of view and decrease the depth of field while greatly magnifying the image.

A

Long or Telephoto Lens or Narrow Angle

32
Q

A special type of camera lens with variable focal length which can be adjusted continuously by the movement of the
variable focus lens

A

Zoom Lens

33
Q

Allows the photographer to get close to the subject without the need of special close – up attachment

A

Macro Lens

34
Q

This refers to the use of a macro lens or a special lens attachment when taking close – up shots.

A

Close – up Shots

35
Q

This refers to simple close – up attachment fitting between the lens and the SLR camera body.

A

Extension Ring

36
Q

This refers to lens that allows photography of objects that is very tall, without the
problem of converging verticals; this occurs when the side of the subjects taper toward the top of the picture.

A

Shift of Perspective Control Lens

37
Q

The failure of light rays to focus properly after they pass through a lens or reflect from a mirror

A

Aberration

38
Q

Lens Defects are?

A

Spherical aberration
Chromatic aberration
Astigmatism
Coma
Curvature of Field
Distortion

39
Q

causes the image of a straight line, at the edges of the field to bow in or out.

A

Distortion

40
Q

The plane of sharpest focus becomes curved, not flat.
It is caused by rays from the outer limits of the subject plane coming to focus nearer to the lens than the axial rays

A

Curvature of Field

41
Q

It occurs when light falling obliquely on the lens and passing through different circular zones is brought to a focus at
different distances from the film plane.

A

Coma

42
Q

The inability of the lens to bring horizontal and vertical lines in the subject to the same plane of focus in the image

A

Astigmatism

43
Q

The failure of different colored light rays to focus after passing through a lens

A

Chromatic aberration

44
Q

The focusing at different points of light rays passing through different parts of spherical lens

A

Spherical aberration

45
Q

Other Lens Defects
are?

A

Flare or Optical Flare
Mechanical Flare
Light Loss

Stray Light

46
Q

Bright spot on the film caused by stray light from worn shiny parts of the lens such as the stops, shutter, lens mount or
from inside the camera itself.

A

Mechanical Flare

47
Q

A result of double reflection from inner lens surfaces.
It exhibits self as a misty hazy or cloudy semi circular path of light

A

Flare or Optical Flare

48
Q

It can be reduced or eliminated by using the proper lens, shade places on the front of the lens or shield

A

Stray Light

49
Q

Most corrected lenses is coated with a substance which will reduce one type of flare (optical) and which will also
increase the optic’s ability to transmit light, thus reducing light to loss.

A

Light Loss

Forensic Lens upto Film (7 decks)

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