Correlation between focal length, angle, Long focal lerand perspectiveFocal length, which is measured in millimeters, is the distance betweenthe middie of the lens to its focal point, it affects the angle andperspective of captured images. A short focal length translates into awide angle, which allows you to capture a wide shot. A long focal lengthtranslates into a narrow angle, which allows you to capture telephotoshots. telephoto shotShort focal lengthnarrow angleLook at these photos below and compare the changes.wide-angle lenswide shotwide angle20 mm angle 50 mm angle 200 mm angle