Unit 1.9

Question 1

What is the approximate lens coverage for a normal lens?

Answer 1

45 degrees, or the approximate angle covered by the human eye

Question 2

What focal length lens is considered to be normal for a 35mm camera?

Answer 2

50mm

Question 3

What are two advantages to using a wide angle lens?

Answer 3

Wider subject area than a normal focal length lens at a given lens-to-subject distance; greater depth of field than a normal lens; allow the photojournalist to use perspective for emphasis.

Question 4

What is the biggest disadvantage of using a wide angle lens?

Answer 4

The converging (distortion) of the image from the edges toward the center of the lens.

Question 5

Describe the basic design of all telephoto lenses.

Answer 5

A positive element in front of and separated from a negative rear element.

Question 6

How does the term “compression” apply to a telephoto lens?

Answer 6

Compression of distant objects creates a sense that the background elements are larger then a normal perspective and enhances objects such as the sun and moon.

Question 7

How does the zoom lens change focal lengths?

Answer 7

Changing the distance between the positive and negative elements of a zoom lens changes the focal length of the lens.

Question 8

What are the three disadvantages of a zoom lens?

Answer 8

1. Loss of lens speed.
2. Loss of image sharpness.
3. Greater chances of problems with refraction, diffraction, and loss of image quality.

Question 9

What is the macro lens designed for?

Answer 9

To be used for small object distances at scales of reproduction larger 1:1.

Question 10

What are two disadvantages of using a macro lens?

Answer 10

1. Extremely short depth of field.

2. Reduction in the amount of light striking the subject, making a tripod of high ISO necessary.

Question 11

What are the two types of fish-eye lenses?

Answer 11

1. Circular

2. Full-frame