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LensesAre classified by their Focal Length
Focal LengthThe distance from the optical center of a lens to the front surface of the imaging device.
Short Focal Length
Wide Angle View
Short Focal LengthEXAMPLE
Entire Football Team
Long Focal Length
Narrow Angle View
Long Focal Length
EXAMPLEOne Football Player
Zoom LensVariable Focal Length
Zoom RangeHow close to how far a lens can see
Lens SpeedHow much light can pass through a lens
Fast LensLets a great amount of light to pass through
Fast LensUse in the evening, when there isn’t much light.
For low light settings
Slow LensLets a small amount of light to pass through
Slow LensUse this on bright, sunny days
For bright light settings
IrisAdjustable lens opening mechanism
ApertureHole in center of irisMeasured by f-stops
ApertureSimilar to the pupil of your eye
ApertureCan adjust larger or smaller depending on the amount of light
ApertureWhat type of aperture opening would you use for a sunny day?
ApertureWhat type of aperture opening would you use for a dark room with only a candle for light?
Auto IrisMany cameras have auto iris
Adjusts automatically depending on setting
FocusWhen subject in viewfinder is sharp and clear.
