Special Focusing Situations - Nikon F4 Instruction Manual

- With the AF-L button depressed, focus will be locked even
if you rem ove your finger from the shutter release button.
- AF-L button can also be used in Single Servo Autofocus
mode.
- Simultaneous use of AE-L (Auto Exposure Lock) button is
recommended. In this case, turn AF-UAE-L simultaneous
lock lever to ( •• ) and press AF-L button.
Special Focusing Situations
To successfully focus, whether using the F4's Electronic Range-
finder, an optical rangefinder, or a clear matte field, the subject
must be reasonably illuminated and have sufficient contrast. If
the focus-not-possible indicator X appears, manually focus by
estimating distance or choose an alternate focus target with
the same distance, lock focus, then recompose.
The following situations are examples that are difficult to focus
and require greater concentration to secure correct focus.
1) When shooting the following:
· Bright subject with a shiny surface, such as silver or
aluminum .
· Strongly backlit subject.
· Scene with variety of subjects located at different distances.
2) When using a linear polarizing filter, or special filter such as
a soft-focus filter. (A circular polarizing filter can be used for
autofocus operation.)
R60 (red) and 056 (orange) filters will interfere with Elec-
tronic Rangefinder and autofocus operation. When using
these filters, focus manually.
41