Nikon D90 - Page 317

Fn button
Can be used for FV lock (pg. 40).
.... . .
. Depth-of-field preview button
Preview depth of field.
Focus-mode selector
Modes Sand ((autofocus)
The camera focuses using autofocus (AF) when shutter-release
button is pressed halfway.
Mode M (manual)
Focus is adjusted manually using the lens focusing ring.
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