Nikon Camera N90 - Manual (Page 66)

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SPECIAL FOCUSING SITUATIONS
Autofocus operation depends on general lighting, subject contrast and detail, and
other technical factors. In rare situations where autofocus (and manual focus with
Electronic Rangefinder) is not possible, ► i blinks telling you to focus manually with
clear matte field (p. 48) or perform autofocus on another subject located at same
distance.
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A. Very dark subject
Focus manually with clear matte field, or
for autofocus, focus on another brighter
subject located at same distance, then
use focus lock (pp. 38-43). Or, use a
Nikon autofocus Speedlight to perform
autofocus with Speedlight's AF
illuminator.
B. Low contrast subject
Focus manually with clear matte field, or
for autofocus, focus on another subject
at same distance but with more contrast,
then use focus lock (pp. 38-43).
C. Strongly backlit subject or bright
subject with shiny surface such as
silver or aluminum, or scene in which
there is a pronounced difference in
brightness, such as the light
patterns created by blinds.
Focus manually with clear matte field.
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