Focal Point Photo Class - Lenses and Depth of Field

On your lens, what is displayed in millimeters?

• shutter speed

• focal length

• aperture

• brand name

Answer explanation

The component displayed in millimeters on the lens is the focal length.

What is another way to refer to aperture?

• f-stop

• s-stop

• f-go

• s-no

Answer explanation

Aperture is also known as f-stop.

With a crop factor of 1, which focal range is considered to be "normal"?

• 24-35mm

• 85-105mm

• 14-24mm

• 40-75mm

Answer explanation

A focal range of 40-75mm is considered 'normal' with a crop factor of 1. This range provides a natural field of view similar to the human eye.

What is the name for the hole in the lens which effects depth of field?

• shutter

• 18th hole

• aperture

• ISO

Answer explanation

The hole in the lens that affects depth of field is called the aperture. It controls the amount of light entering the camera and determines the sharpness of the subject against the background.

Which of the following is true about focal length and distortion?

• It is directly related

• It is not directly related

Answer explanation

Focal length and distortion are not directly related. Distance from the subject causes distortion.

What is the visual effect of narrowing the perceived distance between elements in an image?

• focal length

• compression

• distortion

• catfishing

Answer explanation

Narrowing the perceived distance between elements in an image creates a compression effect.

With a crop factor of 1, which of these focal lengths is considered to be ultra-wide?

• 40-75mm

• 14-24mm

• 24-35mm

• 120-300mm

Answer explanation

With a crop factor of 1, the focal length range of 14-24mm is considered to be ultra-wide. This range offers a wider field of view, making it ideal for capturing expansive landscapes and architecture.

What does the symbol Ø on your lens represent?

• diameter

• Swedes

• aperture

• focal length

Answer explanation

The symbol Ø on your lens represents the diameter. It is used to measure the size of the lens opening, which affects the amount of light that enters the camera.

What describes the amount of the scene that is in focus?

• 20/20

• focal length

• field of view

• depth of field

Answer explanation

Depth of field describes the amount of the scene that is in focus. It determines how much of the image is sharp and in focus, while the rest appears blurred.

Which demonstrates a lens grouping?

• A

• B

• C

• D

Answer explanation

A lens grouping is demonstrated by choice C. A is the front element. B is aperture. D is the rear element.