Lenses Are classified by their Focal Length.

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Presentation transcript:

Lenses Are classified by their Focal Length

Focal Length The distance from the optical center of a lens to the front surface of the imaging device.

Short Focal Length Wide Angle View Wide Angle Lens

Short Focal Length EXAMPLE Entire Football Team

Long Focal Length Narrow Angle View Telephoto Lens

Long Focal Length EXAMPLE One Football Player

Zoom Lens Variable Focal Length

Zoom Range How close to how far a lens can see

Lens Speed How much light can pass through a lens

Fast Lens Lets a great amount of light to pass through

Fast Lens Use in the evening, when there isn’t much light. For low light settings

Slow Lens Lets a small amount of light to pass through

Slow Lens Use this on bright, sunny days For bright light settings

Iris Adjustable lens opening mechanism

Aperture Hole in center of iris Measured by f-stops

Aperture Similar to the pupil of your eye

Aperture Can adjust larger or smaller depending on the amount of light

Aperture What type of aperture opening would you use for a sunny day?

Aperture What type of aperture opening would you use for a dark room with only a candle for light?

Auto Iris Many cameras have auto iris Adjusts automatically depending on setting

Focus When subject in viewfinder is sharp and clear.