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Focal length

Focal length is a fundamental specification of every Lens. It is the distance between the optical center of the lens and the plane on which the lens can focus on the subject, ie where they intersect the light that passes through the lens.

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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