Canon EOS 20D EOS 20D Instruction Manual - Page 93
Built-in Flash Range
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Using the Built-in Flash Built-in Flash Range With EF-S17-85mm f/4-5.6 IS USM ISO speed 100 200 400 800 1600 H: 3200 Wide angle: 17mm Approx. 1 - 3.3 / 3.3 - 10.8 Approx. 1 - 4.6 / 3.3 - 15.1 Approx. 1 - 6.5 / 3.3 - 21.3 Approx. 1 - 9.2 / 3.3 - 30.2 Approx. 1 - 13.0 / 3.3 - 42.7 Approx. 1 - 18.4 / 3.3 - 60.4 With EF-S18-55mm f/3.5-5.6 ISO speed 100 200 400 800 1600 H: 3200 Wide angle: 18mm Approx. 1 - 3.7 / 3.3 - 12.1 Approx. 1 - 5.3 / 3.3 - 17.4 Approx. 1 - 7.4 / 3.3 - 24.3 Approx. 1 - 10.5 / 3.3 - 34.4 Approx. 1 - 14.9 / 3.3 - 48.9 Approx. 1 - 21.0 / 3.3 - 68.9 [m / ft] Telephoto: 85mm Approx. 1 - 2.3 / 3.3 - 7.5 Approx. 1 - 3.3 / 3.3 - 10.8 Approx. 1 - 4.6 / 3.3 - 15.1 Approx. 1 - 6.5 / 3.3 - 21.3 Approx. 1 - 9.2 / 3.3 - 30.2 Approx. 1 - 13.0 / 3.3 - 42.7 [m / ft] Telephoto: 55mm Approx. 1 - 2.3 / 3.3 - 7.5 Approx. 1 - 3.3 / 3.3 - 10.8 Approx. 1 - 4.6 / 3.3 - 15.1 Approx. 1 - 6.6 / 3.3 - 21.7 Approx. 1 - 9.2 / 3.3 - 30.2 Approx. 1 - 13.1 / 3.3 - 43.0 ¡ Use the built-in flash at least 1m/3.3 ft away from the subject. Closer distances will cause the lens to partially obstruct the flash. ¡ When using the built-in flash, detach any hood attahed to the lens. A lens hood will partially obstruct the flash. ¡ When a super telephoto lens or fast, large-aperture lens is attached, the built-in flash coverage might be obstructed. Using an EX-series Speedlite (optional) is recommended. ¡ The built-in flash's coverage is effective with lens focal lengths as short as 17mm. If the lens is shorter than 17mm, the periphery of the flash photo will look dark. ¡ To retract the flash, push it back down. ¡ In the modes, even if you set the shutter speed to one faster than 1/250 sec., it will be set automatically to 1/250 sec. ¡ If autofocus cannot be achieved, the AF-assist beam will be emitted automatically (except in modes). (p.68) 93