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Concepts in Photography
Correlation between focal length, angle,
and perspective
Focal length, which is measured in millimeters, is the distance between
the middle of the lens to its focal point. It affects the angle and
perspective of captured images. A short focal length translates into a
wide angle, which allows you to capture a wide shot. A long focal length
translates into a narrow angle, which allows you to capture telephoto
shots.
Short focal length
wide shot
wide angle
wide-angle lens
Long focal length
telephoto shot
narrow angle
telephoto lens
Look at these photos below and compare the changes.
20 mm angle 50 mm angle 200 mm angle
Normally, a lens with a wide angle is suitable for shooting landscapes and
a lens with a narrow angle is recommended for shooting sports events or
portraits.