Canon POWERSHOT SD400 DIGITAL ELPH User Manual page 46

The viewfinder can be used to conserve power by turning the LCD monitor
off (p. 37) while shooting.
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Viewfinder
Shows the center of the image
image Seen in Viewfinder vs. Recorded image
Usually the recorded image contains more of the scene than is seen in
the viewfinder. Confirm the actual image size with the LCD monitor.
The image recorded may differ from what is seen in the viewfinder due
to the distance between the viewfinder and lens (especially with
close-ups). If you use the viewfinder to take close-up shots, portions of
the close-up subject may not appear in the recorded image. Use the
LCD monitor when taking close-up shots (p. 71).
Aboutthe AutofocusFunction
This camera employs AiAF (artificial intelligence autofocus) technology
which uses a broad metering field to calculate the focal distance with
high precision. It delivers a crisp focus even when the photographic
subject is slightly off-center.
The AiAF function can be turned off so that the autofocus is metered from
a fixed AF frame at the center of the field (p. 89).
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