Unit 1.9 Flashcards
(11 cards)
What is the approximate lens coverage for a normal lens?
45 degrees, or the approximate angle covered by the human eye
What focal length lens is considered to be normal for a 35mm camera?
50mm
What are two advantages to using a wide angle lens?
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.
What is the biggest disadvantage of using a wide angle lens?
The converging (distortion) of the image from the edges toward the center of the lens.
Describe the basic design of all telephoto lenses.
A positive element in front of and separated from a negative rear element.
How does the term “compression” apply to a telephoto lens?
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.
How does the zoom lens change focal lengths?
Changing the distance between the positive and negative elements of a zoom lens changes the focal length of the lens.
What are the three disadvantages of a zoom lens?
- Loss of lens speed.
- Loss of image sharpness.
- Greater chances of problems with refraction, diffraction, and loss of image quality.
What is the macro lens designed for?
To be used for small object distances at scales of reproduction larger 1:1.
What are two disadvantages of using a macro lens?
- Extremely short depth of field.
2. Reduction in the amount of light striking the subject, making a tripod of high ISO necessary.
What are the two types of fish-eye lenses?
- Circular
2. Full-frame
