Canon 550 EX - Manual (Page 34)

2. FE Lock
You can use FE (flash exposure) lock with Type-A cameras. This is the flash
version of AE lock. With FE lock, you use spot metering to obtain the correct
flash exposure reading for a specific part of the subject.
• FE lock works with E-TTL and high-speed sync (FP flash).
Select a picture-taking mode with the
camera.
Focus the subject.
Aim the viewfinder’s spot metering
circle over the part of the subject to
be metered. Then press the <
>
button on the camera. FE lock
remains effective for 16 sec.
• The 550EX fires a preflash to obtain an
exposure reading. The reading is retained in
memory.
• The focusing point linked to the FE lock
lights in red.
• is displayed in the viewfinder for 0.5
sec.
• You can also press the < > button again
to obtain an FE-lock reading for another part
of the subject.
• To cancel FE lock, wait until 16 sec. elapse
or press the < >, <AF>, or < >
button on the camera.
Recompose the picture as desired.
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Check that the subject distance is
within the flash range displayed on
the 550EX’s LCD panel.
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04. F073-E (31~) 02.4.1 2:10 PM Page 34