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Focal length

Focal length by lens construction type.   

  • The ratio of the sensor size and focal length determines the viewing angle.

Division by lens focal length

  • Wide-angle lenses with a small focal length (up to 24 mm) and large viewing angle
  • Normal lenses with a focal length around (50 mm)
  • Telephoto lenses with a long focal length (from 135 mm)

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