Canon EOS-1D X EOS-1D Instructions - Page 113
About TTL and A-TTL Autoflash Speedlites
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Flash Photography with Speedlite 550EX Standard exposure index Current flash exposure level 5 •Set the correct flash exposure level. Adjust the Speedlite's manual flash output and the camera aperture so that the flash exposure level indicator is aligned with the standard exposure index. 6 Compose and take the picture. About TTL and A-TTL Autoflash Speedlites • With TTL and A-TTL autoflash Speedlites (EZ-, E-, EG-, ML-, TL-series) set in the TTL or ATTL autoflash mode, the flash will be fired only at full output. If you set the camera's shooting mode to manual or aperture-priority AE, you can adjust the aperture and fire the flash at full output. Meanwhile, the Speedlite will remain in the TTL or A-TTL autoflash mode. • When the 550EX is set to C.Fn-3-1, the flash will be fired at full output even in the TTL autoflash mode. 6 Flash Photography 113
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