Manual flash guide numberMaximum guide number (at approx. ISO 100)Flash output UnitFlash coverage14 mm*1 24 mm 28 mm 35 mm 50 mm 70 mm 80 mm 105 mm 135 mm 200 mm1/1m 14.8 28.7 30.0 36.0 42.7 47.1 49.1 53.9 55.4 60.0ft. 48.6 94.2 98.4 118.1 140.1 154.5 161.1 176.8 181.8 196.91/2m 10.5 20.3 21.2 25.5 30.2 33.3 34.7 38.1 39.2 42.4ft. 34.4 66.6 69.6 83.7 99.1 109.3 113.8 125.0 128.6 139.11/4m 7.4 14.4 15.0 18.0 21.4 23.6 24.6 27.0 27.7 30.0ft. 24.3 47.2 49.2 59.1 70.2 77.4 80.7 88.6 90.9 98.41/8m 5.2 10.1 10.6 12.7 15.1 16.7 17.4 19.1 19.6 21.2ft. 17.1 33.1 34.8 41.7 49.5 54.8 57.1 62.7 64.3 69.61/16m 3.7 7.2 7.5 9.0 10.7 11.8 12.3 13.5 13.9 15.0ft. 12.1 23.6 24.6 29.5 35.1 38.7 40.4 44.3 45.6 49.21/32m 2.6 5.1 5.3 6.4 7.5 8.3 8.7 9.5 9.8 10.6ft. 8.5 16.7 17.4 21.0 24.6 27.2 28.5 31.2 32.2 34.81/64m 1.9 3.6 3.8 4.5 5.3 5.9 6.1 6.7 6.9 7.5ft. 6.2 11.8 12.5 14.8 17.4 19.4 20.0 22.0 22.6 24.61/128m 1.3 2.5 2.7 3.2 3.8 4.2 4.3 4.8 4.9 5.3ft. 4.3 8.2 8.9 10.5 12.5 13.8 14.1 15.7 16.1 17.41/256*2m 0.9 1.8 1.9 2.3 2.7 2.9 3.1 3.4 3.5 3.8ft. 3.0 5.9 6.2 7.5 8.9 9.5 10.2 11.2 11.5 12.51/512*2m 0.7 1.3 1.3 1.6 1.9 2.1 2.2 2.4 2.4 2.7ft. 2.3 4.3 4.3 5.2 6.2 6.9 7.2 7.9 7.9 8.91/1024*2m 0.5 0.9 0.9 1.1 1.3 1.5 1.5 1.7 1.7 1.9ft. 1.6 3.0 3.0 3.6 4.3 4.9 4.9 5.6 5.6 6.2* 1: When using the wide panel* 2: Not available with high-speed syncFlash coverage(focal length; for35mm full-frame)14 mmWide panel: Manual* Not compatible with EF15mm f/2.8 Fisheye or EF8-15mm f/4L Fisheye USMshooting angles of view24 mmZoom• A: AutoFlash coverage is set automatically, accounting for [Auto zoom for sensor size]and [Light distribution] settings at the lens focal length• M: ManualFlash coverage is set manually* [Auto zoom for sensor size] and [Light distribution] settings are not taken intoaccount28 mm35 mm50 mm70 mm80 mm105 mm135 mm200 mm184