Canon 550 EX - Manual (Page 35)

FE Lock
Check the flash exposure level in the
viewfinder, then take the picture.
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• If the subject is too far away to obtain a correct flash exposure, will blink in the
viewfinder. Either move closer to the subject or use a larger aperture (smaller f-
number) and try again.
• FE lock cannot be used if the 550EX is set to the M (Manual) flash mode. With the
EOS Elan IIE/50E/55 and EOS IX, the icon blinks in the viewfinder to warn that FE
lock cannot be used in the M flash mode.
• The FE lock's preflash fires at about 1/32 output.
• With Type-A cameras other than the EOS-1D, 1V, and 3, the AE lock button functions
as an FE lock button when the 550EX is recharged and ready.
• If the subject is small, using FE lock might not make any difference.
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