Correlation between focal length, angle, and perspective.
Focal length, which is measured in millimetres, 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 narrow angle, which allows you to capture telephoto shots.
Short focal length
Long focal length
Look at these photos below and compare the changes.
Normally, a lens with a wide angle is suitable for shooting landscape and a lens with narrow angle is recommended for shooting sports events or portraits.
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