Chapter 4 Lens

Question 1

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

Answer 1

Lens

Question 2

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

Answer 2

Lens

Question 3

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

Answer 3

Lens

Question 4

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

Answer 4

Lens

Question 5

B. Typology of Lenses (Pallista, 2019)

General Classification

Answer 5

Simple Lenses
Compound Lenses

Question 6

composed of 1 lens

Answer 6

Simple Lenses

Question 7

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

Answer 7

Compound Lenses

Question 8

It consists of two or more simple lenses fitted together

Answer 8

Compound Lenses

Question 9

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

Answer 9

Convex Lens (converging lens/ positive lens)

Question 10

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

Answer 10

Concave Lens (diverging/negative lens)

Question 11

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

Answer 11

Lens Speed

Question 12

is important in taking pictures in dim light

Answer 12

Lens Speed

Question 13

Types of lenses based on Lens Speed

Answer 13

Fast Lens
Slow Lens

Question 14

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.

Answer 14

Fast Lens

Question 15

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

Answer 15

Slow Lens

Question 16

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

Answer 16

Image Size

Question 17

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

Answer 17

Depth of Focus

Question 18

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

Answer 18

Hyperfocal Distance

Question 19

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

Answer 19

Focal Plane

Question 20

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

Answer 20

Infinity

Question 21

This refers to the point of convergence of the light rays

Answer 21

Real Focus

Question 22

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

Answer 22

Virtual Focus

Question 23

Groups of Lenses According to Focal Length and Characteristics are?

Answer 23

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

Question 24

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

Answer 24

Focal Length

Question 25

Focal length controls the following:

Answer 25

Magnification Angle of view Standard or Normal Lens

Question 26

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

Answer 26

Standard or Normal Lens

Question 27

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

Answer 27

Angle of view

Question 28

The size of the image formed by the lens

Answer 28

Magnification

Question 29

It has a shorter focal length than the normal lens.

Answer 29

Short – focal – lens or Wide Angle Lens

Question 30

A lens with extreme wide angle.

Answer 30

Fish Eye Lens

Question 31

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

Answer 31

Long or Telephoto Lens or Narrow Angle

Question 32

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

Answer 32

Zoom Lens

Question 33

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

Answer 33

Macro Lens

Question 34

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

Answer 34

Close – up Shots

Question 35

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

Answer 35

Extension Ring

Question 36

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.

Answer 36

Shift of Perspective Control Lens

Question 37

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

Answer 37

Aberration

Question 38

Lens Defects are?

Answer 38

Spherical aberration Chromatic aberration Astigmatism Coma Curvature of Field Distortion

Question 39

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

Answer 39

Distortion

Question 40

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

Answer 40

Curvature of Field

Question 41

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.

Answer 41

Coma

Question 42

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

Answer 42

Astigmatism

Question 43

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

Answer 43

Chromatic aberration

Question 44

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

Answer 44

Spherical aberration

Question 45

Other Lens Defects are?

Answer 45

Flare or Optical Flare Mechanical Flare Light Loss Stray Light

Question 46

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.

Answer 46

Mechanical Flare

Question 47

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

Answer 47

Flare or Optical Flare

Question 48

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

Answer 48

Stray Light

Question 49

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.

Answer 49

Light Loss