Lens

Question 1

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

Answer 1

Lens

Question 2

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

Answer 2

Lens

Question 3

General classification of lenses

Answer 3

1. Simple lenses
2. Compound lenses

Question 4

It composed of 1 lens

Answer 4

Simple lenses

Question 5

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

Answer 5

Convex Lens

Question 6

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

Answer 6

Convex Lens

Question 7

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

Answer 7

Concave Lens

Question 8

It consists of two or more simple lenses fitted together

Answer 8

Compound lenses

Question 9

Produce aberrated image which can be corrected using compound lenses

Answer 9

Simple lenses

Question 10

It Is a combination of lenses

Answer 10

Compound lenses

Question 11

It is a number of mega fixel

Answer 11

Image size

Question 12

Image produced by the lens depends upon factors camera- to - subject and focal length

Answer 12

Image size

Question 13

Small circle or blur are called?

Answer 13

Circle of confusion

Question 14

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

Answer 14

Focal plane

Question 15

The distance between the lens and the focal plane when the lens is focused on infinity

Answer 15

Focal length

Question 16

Focal length controls the following:

Answer 16

a. Magnification
b. Angle of view

Question 17

The size of the image formed by the Lens

Answer 17

Magnification

Question 18

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

Answer 18

Angle of view

Question 19

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

Answer 19

Standard or normal lens

Question 20

By international standards, 50 mm

Answer 20

Standard or normal lens

Question 21

Lenses with focal lengths from 45 to 60 millimeters are normal lenses because they produce an image that is approximately the same with the view angle of the human eye which is 45 degrees

Answer 21

Standard or normal lens

Question 22

Groups of lenses according to focal length and characteristics

Answer 22

1. Standard or Normal lens
2. Short- focal - lens or wide angles lens
3. Fish eye lens
4. Long or Telephoto lens or Narrow angle
5. Zoom lens
6. Macro lenses

Question 23

It has a shorter focal length than the normal lens. Hens it covers a picture angle of 60 to 90 degrees.

Answer 23

Short- focal -lens or wide angles lens

Question 24

A lens with extreme wide angle

Answer 24

Fish Eye Lens

Question 25

It provides a field of view of 180 degrees or more

Answer 25

Fish eye lens

Question 26

A6- millimeters fish-eye lens made by Nikon has a ____ degree field of view

Answer 26

220

Question 27

Provides an enlarged image of an object

Answer 27

Long of telephoto lens or Narrow lens

Question 28

Lens with longer focal length that constrict the field of view and decrease the depth of field while greatly magnifying the image. e.g. 85mm, 100mm, 200mm, 300mm etc.

Answer 28

Long or telephoto lens or Narrow lens

Question 29

Allows you to take close – up shots while keeping your distance (reach out like telescope) to provide greatly enlarged of a distant object.

Answer 29

Long or telephoto lens or Narrow lens

Question 30

Provides shallow dept of field.

Answer 30

Long or telephoto lens or Narrow lens

Question 31

Angle of view is less than 45 degrees

Answer 31

Long or telephoto lens or Narrow lens

Question 32

This lens allows quick adjustment to give a wider or narrower field of vision but keeping the image in focus. e.g. 24mm – 135mm

Answer 32

Zoom lens

Question 33

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

Answer 33

Zoom lens

Question 34

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

Answer 34

Aberration

Question 35

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

Answer 35

Spherical aberration

Question 36

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

Answer 36

Chromatic aberration

Question 37

The focusing of light of different colors at different points resulting in a blurred image.

Answer 37

Chromatic aberration

Question 38

occurs at the edge of the image; the image appears elliptical or cross-shaped because of an irregularity in the curvature of the lens.

Answer 38

Astigmatism

Question 39

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

Answer 39

Astigmatism

Question 40

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 40

Coma

Question 41

A spot of light appears to have a tail, rather like a comet.

Answer 41

Coma

Question 42

The plane of sharpest focus becomes curved, not flat

Answer 42

Curvature of field

Question 43

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 43

Curvature of field

Question 44

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

Answer 44

Macro lenses

Question 45

Lens defects

Answer 45

1. Spherical aberration 2. Chromatic aberration 3. Astigmatism 4. Coma 5. Curvature of field 6. Distortion

Question 46

Cause the image of straight line at the edge of field to bow in or out

Answer 46

Distortion

Question 47

Other lens defects

Answer 47

1. Flare or Optical Flair 2. Mechanical Flair 3. Light loss 4. Stray light