Olympus E-500 EVOLT E-500 Advanced Manual (English) - Page 52
Manual flash
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Flash shooting Flash off $ The flash does not fire. In this mode, the flash can be used as an AF illuminator when it is raised. g "AF illuminator" (P. 75) Flash synchronization speed Shutter speed can be changed when the built-in flash fires. g "Speed synchronization" (P. 126) 4 Manual flash Various shooting functions This allows the built-in flash to output a fixed amount of light. With [MANUAL FLASH] set to [ON] (g P. 125), the amount of light can be selected in the flash mode setting. To shoot with manual flash, set the f value on the lens based on the distance to the subject. Ratio of amount of light FULL (1/1) 1/4 1/16 1/64 GN: Guide number 13 6 3 1.5 Calculate the f value on the lens using the following formula. Aperture (f value) = GN x ISO sensitivity Distance to the subject (m) ISO sensitivity ISO value Coefficient 100 200 400 800 1600 1.0 1.4 2.0 2.8 4.0 52