[ GLOSSARY DEFINITION ]
Camera
Focal Length
The lens's optical distance in mm; wide (13mm) = wide angle, long (85mm+) = zoom.
Full Definition & Technical Explanation
Focal length describes lens field of view. Short focal lengths like 13 mm are ultrawide; 26 mm is the standard main lens; 85 mm+ is telephoto. See Focal length per camera lens.
It affects composition and distortion. Combined with zoom optics it determines reach.