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Published byCornelia Fields Modified over 9 years ago
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Lenses Are classified by their Focal Length
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The distance from the optical center of a lens to the front surface of the imaging device.
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Short Focal Length Wide Angle View
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Short Focal Length EXAMPLE Entire Football Team
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Long Focal Length Narrow Angle View
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Long Focal Length EXAMPLE One Football Player
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Zoom Lens Variable Focal Length
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Zoom Range How close to how far a lens can see
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Lens Speed How much light can pass through a lens
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Fast Lens Lets a great amount of light to pass through
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Fast Lens Use in the evening, when there isn’t much light. For low light settings
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Slow Lens Lets a small amount of light to pass through
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Slow Lens Use this on bright, sunny days For bright light settings
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Iris Adjustable lens opening mechanism
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Aperture Hole in center of iris Measured by f-stops
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Aperture Similar to the pupil of your eye
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Aperture Can adjust larger or smaller depending on the amount of light
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Aperture What type of aperture opening would you use for a sunny day?
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Aperture What type of aperture opening would you use for a dark room with only a candle for light?
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Auto Iris Many cameras have auto iris Adjusts automatically depending on setting
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Focus When subject in viewfinder is sharp and clear.
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