Kodak DCS 300 Series User Manual page 151

Very dark subject:
Patterned subject or scene, such as building
windows
Low-contrast subject
Focus manually with the clear matte
field, or for Single Servo AF, focus
on another brighter subject located
at the same distance, then use Focus
Lock (page 6-36) or use a Nikon
autofocus Speedlight to focus
automatically with the Speedlight's
AF illuminator.
Focus manually with the clear matte
field or use Single Servo AF to
focus on another subject with no
pattern. The second subject should
be at the same distance as the first.
Lock focus (page 6-36) and
recompose.
Focus manually with the clear matte
field, or use Single Servo AF to
focus on another subject at the same
distance but with more contrast,
then lock focus and recompose.
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